- Diogenes of Sinope
Διογένης ὁ Σινωπεύς
(c. 412- c. 323 BCE),
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My Favorite Quotations[Diogenes of Sinope] lit a lamp in broad daylight and said, as he went about, "I am looking for a [virtuous] man."
-- Teaching of Diogenes of Sinope (412–323 BCE) from Lives of Eminent Philosophers by Diogenes Laertius
The unexamined life is not worth living.
-- Socrates, from the Apology by Plato (429–347 BCE)
When truth is buried underground, it grows and it builds up so much force that the day it explodes it blasts everything with it.
-- Émile Zola (1840–1902), French writer and political activist, from J'accuse! published in L'Aurore [The Dawn] (13 Jan 1898)
Economic "progress" is good only to the point of sufficiency, beyond that, it is evil, destructive, uneconomic.
-- E. F. Schumacher (1911-1977), from "Economics in a Buddhist Country" (1955)
Christianity... is the most avowedly materialist of all the great religions… Its own most central saying is: "The Word was made flesh," where the last term was, no doubt, chosen because of its specially materialistic associations. By the very nature of its central doctrine Christianity is committed to a belief in the ultimate significance of the historical process, and in the reality of matter and its place in the divine process.
-- William Temple (1881–1944), Archbishop of Canterbury, from Nature, Man and God (1934), p. 317
The beginnings of cosmic religious feeling already appear [at an early stage] of development, e.g., in many of the Psalms of David and in some of the Prophets. Buddhism, as we have learnt especially from the wonderful writings of Schopenhauer, contains a much stronger element of this. The religious geniuses of all ages have been distinguished by this kind of religious feeling, which knows no dogma and no God conceived in man's image; so that there can be no Church whose central teachings are based on it. Hence it is precisely among the heretics of every age that we find men who were filled with this highest kind of religious feeling and were in many cases regarded by their contemporaries as Atheists, sometimes also as saints. Looked at in this light, men like Democritus, Francis of Assisi, and Spinoza are closely akin to one another.
-- Albert Einstein (1879–1955), from The World as I See It (1934), p. 21.
There are many, you know, who think that this life journey through the world is not the first one we have made. Haven't you ever come across children who knew things that it was impossible for them to have learned? Have you ever gone to a place for the first time and felt sure that you had been there before? That's one of the reasons I do not travel much.
-- Henry Ford (1863-1947), from interview by S.J. Woolf in New York Times Magazine dated 24 July 1938
A human being is a part of the whole, called by us "Universe," a part limited in time and space. He experiences himself, his thoughts and feelings as something separate from the rest—a kind of optical delusion of his consciousness. The striving to free oneself from this delusion is the one issue of true religion. Not to nourish it but to try to overcome it is the way to reach the attainable measure of peace of mind.
-- Albert Einstein (1879–1955), from a letter to Robert S. Marcus dated 12 Feb 1950 quoted in The New Quotable Einstein (2005), p. 206, by Alice Calaprice
[T]he world is in greater peril from those who tolerate or encourage evil than from those who actually commit it.
--Albert Einstein (1879–1955), from his tribute to Pablos Casals (30 March 1953) quoted in Conversations with Casals (1957), by Josep Maria Corredor
There may be times when we are powerless to prevent injustice, but there must never be a time when we fail to protest.
– Elie Wiesel, from his Nobel Lecture, 11 December 1986
Power concedes nothing without a demand. It never did and it never will. Find out just what any people will quietly submit to and you have found out the exact measure of injustice and wrong which will be imposed upon them.
-- Frederick Douglass (1818–1895), in a speech delivered at Canandaigua, New York on 4 August 1857, quoted in Two Speeches by Frederick Douglass (1857), p. 22
To be hopeful in bad times is not just foolishly romantic. It is based on the fact that human history is a history not only of cruelty, but also of compassion, sacrifice, courage, kindness. What we choose to emphasize in this complex history will determine our lives. If we see only the worst, it destroys our capacity to do something. If we remember those times and places — and there are so many — where people have behaved magnificently, this gives us the energy to act, and at least the possibility of sending this spinning top of a world in a different direction. And if we do act, in however small a way, we don’t have to wait for some grand utopian future. The future is an inﬁnite succession of presents, and to live now as we think human beings should live, in defiance of all that is bad around us, is itself a marvelous victory.
-- Howard Zinn (1922-2010), from A Power Governments Cannot Suppress (2006)
Taxation is the price which we pay for civilization, for our social, civil and political institutions, for the security of life and property, and without which, we must resort to the law of force.
-- 1852, Journal of the House of Representatives of the State of Vermont, October Session, 1851, Appendix: Report of the Committee Appointed by the Governor to Take into Consideration the Financial Affairs of the State, Start Page 368, Quote Page 369, Printed by Chauncey Goodrich, Burlington, Vermont.
What I teach now as before, O monks, is dukkha and the cessation of dukkha.
-- Siddhārtha Gautama (563–483 BCE), the Buddha, from Alagaddupama Sutta: The Water-Snake Simile (MN 22)
Once Chuang Chou dreamt he was a butterfly, a butterfly flitting and fluttering around, happy with himself and doing as he pleased. He didn't know he was Chuang Chou. Suddenly he woke up and there he was, solid and unmistakable Chuang Chou. But he didn't know if he was Chuang Chou who had dreamt he was a butterfly, or a butterfly dreaming he was Chuang Chou. Between Chuang Chou and a butterfly there must be some distinction! This is called the Transformation of Things.
-- Chuang Tzu (369—298 BCE), from The Complete Works Of Chuang Tzu, chapter 2, translated by Burton Watson (1968)
Nothing is so insufferable to man as to be completely at rest, without passions, without business, without diversion, without study. He then feels his nothingness, his forlornness, his insufficiency, his dependence, his weakness, his emptiness.
-- Blaise Pascal (1623–1662), from Pascal's Pensees (1669)
Those who cannot remember the past are condemned to repeat it.
-- George Santayana (1863–1952), from The Life of Reason, Vol. 1, chapter 12 (1905–1906), Charles Scribner & Sons, p. 284
There is nothing which can better deserve [our] patronage, than the promotion of Science and Literature. Knowledge is in every country the surest basis of publick happiness.
-- George Washington, in his address to Congress on 8 January 1790
Establish & improve the law for educating the common people...The tax which will be paid for this purpose is not more than the thousandth part of what will be paid to kings, priests & nobles who will rise up among us if we leave the people in ignorance.
-- Thomas Jefferson, in a letter to George Wythe dated 13 August 1786
Laws for the liberal education of youth, especially for the lower classes of people, are so extremely wise and useful that to a humane and generous mind, no expense for this purpose would be thought extravagant.
-- John Adams, from Thoughts on Government, April, 1776
It is ironic that the United States should have been founded by intellectuals; for throughout most of our political history, the intellectual has been for the most part either an outsider, a servant, or a scapegoat.
-- Richard Hofstadter, from Anti-Intellectualism in American Life, pp. 145-146
Shake off all the fears & servile prejudices, under which weak minds are servilely crouched. Fix reason firmly in her seat, and call to her tribunal every fact, every opinion. Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason, than that of blindfolded fear.
-- Thomas Jefferson, in a letter to his nephew, Peter Carr, dated 10 August 1787
If ever there can be a cause worthy to be upheld by all toil or sacrifice that the human heart can endure, it is the cause of Education.
-- Horace Mann (1796–1859), from Thoughts Selected from the Writings of Horace Mann (1872), p. 7.
The all-important fact in the situation is this; any time the college professors of America get ready to take control of their own destinies, and of the intellectual life of their institutions, they can do it. There is not a college or university in the United States today which could resist the demands of its faculty a hundred percent organized and meaning business.
-- Upton Sinclair (1878–1968), from The Goose-Step: A Study of American Education (1923), p. 458
I hope we shall... crush in it’s birth the aristocracy of our monied corporations which dare already to challenge our government to a trial of strength and bid defiance to the laws of our country.
-- Thomas Jefferson, in a letter to George Logan dated 12 November 1816
It is, no doubt, a very laudable effort, in modern teaching, to render as much as possible of what the young are required to learn, easy and interesting to them. But when this principle is pushed to the length of not requiring them to learn anything but what has been made easy and interesting, one of the chief objects of education is sacrificed. I rejoice in the decline of the old brutal and tyrannical system of teaching, which however did succeed in enforcing habits of application; but the new, as it seems to me, is training up a race of men who will be incapable of anything which is disagreeable to them....A pupil from whom nothing is ever demanded which he cannot do, never does all he can.
-- John Stuart Mill (1806–1873), from the Autobiography of John Stuart Mill (1924), p. 37
How comes it that a cripple does not offend us, but that a fool does? Because a cripple recognizes that we walk straight, whereas a fool declares that it is we who are silly; if it were not so, we should feel pity and not anger.
-- Blaise Pascal (1623–1662), from Pascal's Pensees (1669)
The suppression of uncomfortable ideas may be common in religion or in politics, but it is not the path to knowledge, and there's no place for it in the endeavor of science.
-- Carl Sagan, from the Cosmos television series
The young specialist in English Lit ... lectured me severely on the fact that in every century people have thought they understood the Universe at last, and in every century they were proved to be wrong. It follows that the one thing we can say about our modern "knowledge" is that it is wrong. ... My answer to him was, "... when people thought the Earth was flat, they were wrong. When people thought the Earth was spherical they were wrong. But if you think that thinking the Earth is spherical is just as wrong as thinking the Earth is flat, then your view is wronger than both of them put together."
-- Isaac Asimov, The Relativity of Wrong, Kensington Books, New York, 1996, p 226.
A time is coming when those who are in the mad rush today of multiplying their wants, vainly thinking that they add to the real substance, real knowledge of the world, will retrace their steps and say what have we done? Civilizations have come and gone and in spite of all our vaunted progress, I am tempted to ask again and again: To what purpose?
-- Mohandas K. Gandhi (1869–1948) from D.G. Tendulkar, Mahatma: Life of Mohandas Karamchand Gandhi Vol. 2, 2nd edn.(1960), p. 29.
Can we reconcile the idea that copying errors are an essential prerequisite for evolution to occur, with the statement that natural selection favours high copying-fidelity?
-- Richard Dawkins, from The Selfish Gene (2006) Oxford Univ. Press, p. 17
Let me try to make crystal clear what is established beyond reasonable doubt, and what needs further study, about evolution. Evolution as a process that has always gone on in the history of the earth can be doubted only by those who are ignorant of the evidence or are resistant to evidence, owing to emotional blocks or to plain bigotry. By contrast, the mechanisms that bring evolution about certainly need study and clarification. There are no alternatives to evolution as history that can withstand critical examination. Yet we are constantly learning new and important facts about evolutionary mechanisms.
-- Theodosius Dobzhansky (1900–1975), from "Nothing in Biology Makes Sense Except in the Light of Evolution", The American Biology Teacher Vol.35, No. 3 (March 1973), pp. 125-129
... there are many reasons why you might not understand [an explanation of a scientific theory] ... Finally, there is this possibility: after I tell you something, you just can't believe it. You can't accept it. You don't like it. A little screen comes down and you don't listen anymore. I'm going to describe to you how Nature is - and if you don't like it, that's going to get in the way of your understanding it. It's a problem that [scientists] have learned to deal with: They've learned to realize that whether they like a theory or they don't like a theory is not the essential question. Rather, it is whether or not the theory gives predictions that agree with experiment. It is not a question of whether a theory is philosophically delightful, or easy to understand, or perfectly reasonable from the point of view of common sense. [A scientific theory] describes Nature as absurd from the point of view of common sense. And it agrees fully with experiment. So I hope you can accept Nature as She is - absurd.
--Richard P. Feynman (1918–1988), from QED: The Strange Theory of Light and Matter (Feynman 1985), pp. 9-10
Males do not represent two discrete populations, heterosexual and homosexual. The world is not to be divided into sheep and goats. Not all things are black nor all things white. It is a fundamental of taxonomy that nature rarely deals with discrete categories. Only the human mind invents categories and tries to force facts into separated pigeon-holes. The living world is a continuum in each and every one of its aspects. The sooner we learn this concerning human sexual behavior, the sooner we shall reach a sound understanding of the realities of sex.
-- Alfred C. Kinsey, Wardell R. Pomeroy, and Clyde E. Martin. Sexual Behavior in the Human Male. (Philadelphia, Pa: W.B. Saunders, 1948) pp. 610-666.
In a republican nation, whose citizens are to be led by reason and persuasion, and not by force, the art of reasoning becomes of first importance.
--Thomas Jefferson in a letter to David Harding, from Monticello, 20 April 1824; found in H.A. Washington, ed., The Writings of Thomas Jefferson (New York : H.W. Derby, 1861).
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Michel Adanson was born. Following study at the Plessis Sorbon, the Collège Royal, and the Jardin du Roi, Adanson traveled to Senegal where he spent four years collecting natural history specimens. The report of this expedition appeared in 1757 as Histoire naturelle du Sénégal, and it contained a novel systematic arrangement of mollusks that won Adanson some notoriety in zoological circles. He is best remembered, however, for his comprehensive Familles des plantes (Paris, 1763–1764), in which he rejected systems (such as those of Linnaeus) that were based on only a few selected characters (artificial systems), in favor of an arrangement that takes all features of the plant into account (a natural system). As an associate of Buffon, Adanson was a significant contributor to the Historie naturelle, and his own herbarium, numbering about 30,000 specimens, came to rest in Paris at the Muséum National d’Histoire Naturelle.On this date, the French botanist
On this date, two articles were published in the science journal Nature reporting the discovery of a fossil that might in time become as much of an evolutionary icon as the proto-bird Archaeopteryx. Several specimens of this transitional form, named Tiktaalik roseae, were found in late Devonian river sediments on Ellesmere Island in Nunavut, Arctic Canada.
- Ahlberg, P.E., Clack, J.A. (2006). Palaeontology: A firm step from water to land. Nature, 440(7085), 747-749. DOI: 10.1038/440747a
- Daeschler, E.B., Shubin, N.H., Jenkins, F.A. (2006). A Devonian tetrapod-like fish and the evolution of the tetrapod body plan. Nature, 440(7085), 757-763. DOI: 10.1038/nature04639
- Shubin, N.H., Daeschler, E.B., Jenkins, F.A. (2006). The pectoral fin of Tiktaalik roseae and the origin of the tetrapod limb. Nature, 440(7085), 764-771. DOI: 10.1038/nature04637
- “What has the head of a crocodile and the gills of a fish?“, the Understanding Evolution website, the University of California Museum of Paleontology and the National Center for Science Education. Last updated June 2010, accessed on 26 April 2011. http://evolution.berkeley.edu/evolibrary/news/060501_tiktaalik
Rhizopoda (meaning “root-foot”). This name was later changed to protozoa. In 1835, he disproved Ehrenberg’s hypothesis that microorganisms have the same organs as the more complex animals.On this date, the French physiologist, morphologist, and taxonomist Félix Dujardin was born. Dujardin is primarily known for his work with microscopic animal life, and in 1834 proposed that a new group of one-celled organisms be called
Also in 1835, he was the first to describe protoplasm, the jellylike material in animal cells which he called sarcode (from the Greek word σάρξ, meaning “flesh”). [Hugo von Mohl is credited with introducing the name protoplasm for it in 1846.] This substance, now called cytoplasm, was later found in living plant cells. Although the term protoplasm is rarely used any more in a strictly scientific sense, many of the notions associated with the term have survived. Thus it is still accepted that all living organisms are made largely of the same classes of substances such as salts and organic molecules, that some of these are organized into structures large enough to be seen in the microscope, and that water almost always is by far the most abundant material.
Dujardin’s written works include Histoire naturelle des infusoires (1840), Manuel de l’observateur au microscope (1842), and Histoire naturelle des helminthes (1844).
read papers on original research on the biology of tiny marine organisms found along the Scottish coast to the Plinian Society at Edinburgh University.On this date, Charles Darwin
The root of all superstition is that men observe when a thing hits, but not when it misses.
– Francis Bacon (1561-1626), English lawyer and philosopher
On this day, the American psychologist, author, inventor, social philosopher, and poet B(urrhus) F(rederic) Skinner was born. He developed the theory of operant conditioning — the idea that behavior is determined by its consequences, be they reinforcements or punishments, which make it more or less likely that the behavior will occur again. His principles are still incorporated within treatments of phobias, addictive behaviors, and in the enhancement of classroom performance (as well as in computer-based self-instruction).
Skinner believed that the only scientific approach to psychology was one that studied behaviors, not internal (subjective) mental processes. He denied the existence of a mind as a thing separate from the body, but he did not deny the existence of thoughts, which he regarded simply as private behaviors to be analyzed according to the same principle as publicly observed behaviors. To further improve the objective scientific value of observed behaviors, he invented the “Skinner box”, or operant conditioning chamber. It was a small, soundproof enclosure in which an animal could be isolated from all distractions and outside influences, responding only to the controlled conditions within the box, and is still used today.
Skinner’s analysis of human behavior culminated in his work Verbal Behavior (1957). He was a prolific author who published 21 books and 180 articles. In a June, 2002 survey, B.F. Skinner was listed as the most influential psychologist of the 20th century (Review of General Psychology, June, 2002, pp. 139-152). He was named “Humanist of the Year” in 1972 by the American Humanist Association.
One of Skinner’s most interesting and famous experiments, a classic in psychology, examined the formation of “superstition” in one of his favorite experimental animals, the pigeon. Skinner placed a series of hungry pigeons in a cage attached to an automatic mechanism that delivered food to the pigeon “at regular intervals with no reference whatsoever to the bird’s behavior.” He discovered that the pigeons associated the delivery of the food with whatever chance actions they had been performing as it was delivered (accidental reinforcement), and that they subsequently continued to perform these same actions:
One bird was conditioned to turn counter-clockwise about the cage, making two or three turns between reinforcements. Another repeatedly thrust its head into one of the upper corners of the cage. A third developed a ‘tossing’ response, as if placing its head beneath an invisible bar and lifting it repeatedly. Two birds developed a pendulum motion of the head and body, in which the head was extended forward and swung from right to left with a sharp movement followed by a somewhat slower return.
Skinner suggested that the pigeons behaved as if they were influencing the automatic mechanism with their “rituals” and that this experiment shed light on human behavior:
The experiment might be said to demonstrate a sort of superstition. The bird behaves as if there were a causal relation between its behavior and the presentation of food, although such a relation is lacking. There are many analogies in human behavior. Rituals for changing one’s fortune at cards are good examples. A few accidental connections between a ritual and favorable consequences suffice to set up and maintain the behavior in spite of many unreinforced instances. The bowler who has released a ball down the alley but continues to behave as if she were controlling it by twisting and turning her arm and shoulder is another case in point. These behaviors have, of course, no real effect upon one’s luck or upon a ball half way down an alley, just as in the present case the food would appear as often if the pigeon did nothing — or, more strictly speaking, did something else.
It is easy to see other human parallels of this type of behavior. A person playing a slot machine may alter the way he puts money in the machine and the way he pulls the handle if he thinks that doing these things a certain way will bring him luck. Independent of these behaviors the machine will occasionally pay off (reinforcement). Such a situation allows the person to develop a superstitious behavior, such as not looking at the machine while he pulls the handle. Observation of a gambling casino will reveal a large number of people displaying their superstitious behaviors at the slot machines. Each person’s superstition may be unique to him, as each of Skinner’s pigeons had a unique superstition.
Human superstitions are quite abundant. A college student in an elevator may keep pushing the button of his floor as if this would cause the elevator to move faster. A card player may pick up his cards one at a time as if to improve the hand he was dealt. A businessman may wear a “special” tie when going to an important meeting.
Many ancient beliefs involve superstition. For example, the rain dance: once when someone was doing the so-called rain dance, it started to rain. This person thought that perhaps their dance affected nature. After this rain dance was reinforced intermittently on a frequent enough schedule it became established as a superstitious behavior.
However, the pigeons’ behaviors were later reinterpreted as behaviors that improve foraging efficacy (analogous to salivation in Pavlov’s dogs), which suggests that the pigeons’ behavior does not correspond to Skinner’s intended meaning of superstition. Nevertheless, Skinner’s early account is notable in two respects. First, it recognized the possibility of superstition occurring outside the human realm. Second, and linked to this, Skinner emphasized the behavioral aspect of superstition: “The bird behaves as if there were a causal relation between its behavior and the presentation of food, although such a relation is lacking.” That is, he focused on there being an incorrect response to a stimulus (behavioral outcome), rather than the conscious abstract representation of cause and effect (psychological relationship), with which human superstitions are often associated.
There other differences between human superstitions based on psychological relationship and animal superstitions based on behavioral outcome:
- First, humans, as opposed to animals, often spend considerable time justifying why they are not reinforced each time they do their superstitious behavior. (“I have some questions about that so- called virgin we sacrificed to the volcano god.” “I lost the golf match today because my lucky hat doesn’t seem to work two days in a row.”)
- Second, humans spend more time than animals trying to convince others to adopt their superstitious behaviors. Children often carry on many of the superstitions of their parents.
- Finally, as Herrnstein (1966) points out, “Human superstition, unlike that of animals, arises in a social context.” The acquired superstitions in humans are not as arbitrary as those of animals. Rather they are molded by the person’s culture. Thus, although it is possible to develop a superstition about Wednesday the 11th, it is more probable in our culture to be superstitious about Friday the 13th.
It has only been with the advent of the scientific method that people have been able to distinguish between that which is superstitious and that which has a scientific basis.
- B.F. Skinner. “‘Superstition’ in the Pigeon,” Journal of Experimental Psychology 38: 168-172 (1948).
- Kevin R. Foster and Hanna Kokko.
“The evolution of superstitious and superstition-like behaviour,”
Proc R Soc B 276 (1654): 31-37 (January 2009). DOI: 10.1098/rspb.2008.0981
- R.J. Herrnstein. “Superstition: A corollary of the principles of operant conditioning,” in W. K. Honig (ed.), Operant Behavior: Areas of Research and Application. (New York: Appleton-Century-Crofts, 1966) pp. 33-51.
On this date, the historical debate that took place at the French Academy of Sciences between Georges Cuvier and Etienne Geoffroy Saint-Hilaire began.
The zoologist and historian of science E.R. Russell summed up the great biological controversy of the first half of the nineteenth century: “Is function the mechanical result of form, or is form merely the manifestation of function or activity? What is the essence of life — organization or activity?” While Cuvier founded the “functionalist” school of organismal biology, with his insistence on animals as functionally integrated wholes, Geoffroy continued the more “formalist” tradition of biology that had started with Buffon and was being continued by Goethe, Lamarck, and others.
Cuvier viewed every part of an animal as having been designed by the Creator to contribute to the animal’s functional integrity. Thus, similarities between organisms could only result from similar functions, writing in 1828, “If there are resemblances between the organs of fishes and those of the other vertebrate classes, it is only insofar as there are resemblances between their functions.” Cuvier argued that all animals could be subdivided into four and only four distinct embranchements: vertebrates, molluscs, articulates (insects and crustaceans), and radiates.
Cuvier’s viewpoint is diametrically opposed to Geoffroy’s view, which stressed the primacy of structure over function; Geoffroy wrote in 1829: “Animals have no habits but those that result from the structure of their organs; if the latter varies, there vary in the same manner all their springs of action, all their faculties and all their actions.”
Geoffrey said that unity of plan could be identified by the relative positions and spatial interrelationships of elements, rather than primarily by their shape or size. Parts may expand and contract according to their function, but topology remains unaltered, and the archetype can be traced by an unvarying spatial pattern. He called this the principle of connections. (This is still a favored basis for recognizing anatomical homologies.)
Geoffroy wrote in 1807 (see Appel, 1987, p. 89):
It is known that nature works constantly with the same materials. She is ingenious to vary only the forms…One sees her tend always to cause the same elements to reappear, in the same number, in the same circumstances, and with the same connections.
As Charles Darwin described his work in 1859, in The Origin of Species:
What can be more curious than that the hand of a man, formed for grasping, that of a mole for digging, the leg of the horse, the paddle of the porpoise, and the wing of the bat, should all be constructed on the same pattern, and should include the same bones, in the same relative positions? Geoffroy St. Hilaire has insisted strongly on the high importance of relative connexion in homologous organs: the parts may change to almost any extent in form and size, and yet they always remain connected together in the same order.
In 1822, Geoffroy had dissected a lobster and placed it in an inverted position with respect to the ground. In this upside down orientation the lobster’s normally ventral nerve cord was located above the digestive tract, which in turn was placed above the heart. In his own words: “What was my surprise, and I add, my admiration, in perceiving an ordering that placed under my eyes all the organic systems of this lobster in the order in which they are arranged in mammals?” Geoffroy went on to argue that there was a unity of plan, or unity of composition, among animals, so that the dorsal side of the vertebrates was homologous to the ventral side of the arthropods. In 1822, he wrote that “insects formed another class of vertebrated animals, and that they were, consequently, brought under the common law of uniformity of organization”.
Thus, Geoffroy and his followers argued that all animals, vertebrates and invertebrates alike, were built on the same basic plan. Therefore, animal life could be strung into a more or less continuous, related series, rather than broken into discrete “divisions”, as Cuvier had claimed. This series implied that the history of each organism, rising in complexity from starfish to humans, could be interpreted in an evolutionary manner.
Matters between Cuvier and Geoffry came to a head in 1830, when two young naturalists, Meyranx and Laurencet, presented a comparison of the anatomy of vertebrates and cephalopods (squids, cuttlefish, and octopi), claiming that they were based on the same basic structural plan. Geoffroy enthusiastically adopted this claim as proof of the unity of plan shared by all animals; Cuvier could not reconcile it with the results of his careful anatomical research. Thus was set up one of the most famous debates in the history of biology: eight public debates between Cuvier and Geoffroy, from February to April 1830. In these debates, Cuvier showed convincingly that many of Geoffroy’s supposed examples of unity of structure were not accurate; the similarities between vertebrates and cephalopods were contrived and superficial.Remarkably, Geoffroy’s idea today is supported by a growing body of molecular developmental evidence. Holley et al (1995) have demonstrated that not only do the fruit fly and frog have homologous genes that promote dorsoventral patterning, but the homologous genes have opposite effects within each animal. In fact, the genes are functionally interchangeable –- even though the product of sog ventralizes fly embryos, it dorsalizes frog embryos just like its homologue in the frog, chordin.
It would be an error to call Geoffroy an evolutionary biologist in anything like the modern sense. Archetypes were abstractions, not once-living ancestors; shared archetypal form did not necessarily indicate common ancestry. Geoffrey used the term “homologous” in its anatomical sense, meaning those parts in different animals which were “essentially” the same, even though the parts might have different shapes and functions. However, later in his career, Geoffroy published some ideas that resemble the theory of evolution by natural selection. The following quote from “Influence du monde ambiant pour modifier les formes animales” (1833) shows that Geoffroy considered that heritable changes in an organism might be selected for or against by the environment, and thus that present-day species might have arisen from antediluvian (before the Biblical Flood) species:
The external world is all-powerful in alteration of the form of organized bodies.. . these [modifications] are inherited, and they influence all the rest of the organization of the animal, because if these modifications lead to injurious effects, the animals which exhibit them perish and are replaced by others of a somewhat different form, a form changed so as to be adapted to the new environment.
But these ideas apparently were never a key part of Geoffroy’s thought. Geoffroy believed that there were limits to how far an organism might evolve, and he never developed his ideas into a complete theory, as Darwin later did.
Part of the power of modern evolutionary biology comes from its ability to synthesize elements from both schools of thought. Organismal lineages change with time, in response to changing environments, and their form constrains the functions that they can take on; at the same time, it is the ability of organisms to function in their environments that is a major component of evolutionary fitness, and form is often altered to fit a particular function. Cuvier and Geoffroy had grasped separate parts of a more complex reality.
- Toby A. Appel. The Cuvier-Geoffrey Debate: French Biology in the Decades before Darwin (Oxford University Press, 1987).
- Stephen J. Gould, The Structure of Evolutionary Theory (Harvard University Press, 2002) pp. 298-312.
- S.A. Holley, P.D. Jackson, Y. Sasal, B. Lu, E.M. De Robertis, F.M. Hoffmann, and E.L. Ferguson. A conserved system for dorsal-ventral patterning in insects and vertebrates involving sog and chordin, Nature 376: 249-253 (1995).
- Ernst Mayr. The Growth of Biological Thought: Diversity, Evolution and Inheritance (Cambridge, MA: Harvard Univ. Press, 1982) p 262.
On this date, Richard Owen gave a public lecture entitled “On the Nature of Limbs,” at an evening meeting of the Royal Institution of Great Britain in London. This lecture laid out to a general audience Owen’s notion of homology in general, and his account of vertebrate limbs in particular. Earlier, in 1843, Owen had defined a homology as the “same organ in different animals under every variety of form and function” (Owen 1843, p.379). The 1848 book On the Archetype and the Homologies of the Vertebrate Skeleton had introduced his sophisticated theoretical and observational framework in comparative morphology. Now in the 1849 lecture, Owen forcefully argued for fins as found in different groups of fish and limbs as occurring in different tetrapod taxa being homologous, by pointing to homologies among the individual skeletal parts of fins and limbs. Published in the same year under the title On the Nature of Limbs, this lecture, together with On the Archetype, marks Owen’s most innovative contribution to comparative biology, which made him the most prominent naturalist in Britain before Darwin.
On this date, the English entomologist Henry Walter Bates was born. Bates became friends with Alfred Russel Wallace when the latter took a teaching post in the Leicester Collegiate School. Wallace was also a keen entomologist, and he had read the same kind of books as Bates had, and as Darwin, Huxley and no doubt many others had – Thomas Malthus on population, James Hutton and Charles Lyell on geology, Charles Darwin’s Voyage of the Beagle, and above all, the anonymous Vestiges of the Natural History of Creation, which put evolution into everyday discussion among literate folk. They also read William H. Edwards on his Amazon expedition, and this started them thinking that a visit to the region would be exciting, and might launch their careers. Bates accompanied Wallace on an expedition to the Amazon in 1848.
Whereas Wallace returned to England after four years in South America and then went on to Indonesia, Bates stayed in the Amazon for eleven years but continued to correspond with him, encouraging Wallace’s developing theories on organic evolution. Bates discovered that closely related species often were separated geographically by rivers, and later realized that this was evidence of geographical speciation. His 1862 study of color patterns in butterflies established what is now called Batesian mimicry, in which non-poisonous animals mimic the bright warning coloration of poisonous animals. Bates argued that this kind of mimicry could not be produced by Lamarckian use-inheritance and was clear evidence of selection. In his book The Naturalist on the River Amazons (1863), he wrote:
… on these expanded membranes [i.e., butterfly wings] Nature writes, as on a tablet, the story of the modifications of species, so truly do all changes of the organisation register themselves thereon. Moreover, the same colour-patterns of the wings generally show, with great regularity, the degrees of blood-relationship of the species. As the laws of nature must be the same for all beings, the conclusions furnished by this group of insects must be applicable to the whole world.
Bates assumed the post of Assistant Secretary of the Royal Geographical Society in 1864 where he edited the society’s Transactions and organized expeditions. He was elected a Fellow of the Royal Society of London in 1881.
On this date, the British physician, geologist, and paleontologist Gideon Algernon Mantell was born. He discovered 4 of the 5 genera of dinosaurs known during his time.
Mantell’s life-long hobby was all-consuming. While walking with his wife in 1822, he discovered fossils that he identified as teeth. When he saw the connection with teeth of the present lizard, the iguana, in 1825, he named the animal the Iguanadon (“fossil teeth”). Subsequently, he made additional finds of fossil bones of other large animals which he described accurately: the Hylaeosaurus, Pelorosaurus, and Regnosaurus. His contemporary, paleontologist Sir Richard Owen, coined the word dinosaur (“terrible lizards”). Mantell’s books include Medals of Creation (1844).
Gunnar Säve-Söderbergh was born. He took bachelor’s and licentiate’s degrees at Uppsala University in 1931 and 1933, respectively, and was appointed professor of historical geology at Uppsala in 1937.On this date, the Swedish geologist and paleontologist
In 1928, Säve-Söderbergh led a team that discovered extraordinarily fossiliferous beds in the upper Devonian of east Greenland. These 360-million-year-old rocks contained numerous fossils of bony fish and one set of particularly interesting remains. These latter fossils possessed a fish-like tail, ribs, and back, yet also had limbs with fingers and toes. This new species was dubbed Ichthyostega by Säve-Söderbergh in 1932 and was described in a series of papers by Erik Jarvik. It is widely featured in the scientific literature as the first “four-legged fish”. Although Ichthyostega may not be the ancestor of today’s terrestrial vertebrates, it no doubt is a transitional form.Ichthyostega‘s combination of fish and amphibian characters led to speculation about how the origin of tetrapods and the invasion of land by vertebrates could be related. One hypothesis, formulated by Joseph Barrell and later revised by Alfred Romer, held that one group of fish, such as Ichthyostega, adapted to more terrestrial environments due to the drying of Devonian ponds. Recent discoveries have changed this conception entirely.
Säve-Söderbergh was made an honorary doctor at Uppsala in 1942 and was elected a member of the Royal Swedish Academy of Sciences in 1948. Unfortunately, tuberculosis put an untimely end to his career. He died in 1948 at Solbacken, a sanatorium in Dalarna, Sweden.
William Buckland, Professor of Geology at Oxford University and an ordained priest in the Church of England, had been contacted by the Talbot family of Penrice Castle on the Gower Peninsula in South Wales, England, who had reported finding “bones of elephants” on 27 December 1822. Descending into Paviland Cave (or Goat’s Hole Cave) on today’s date, Buckland discovered one of the best-known prehistoric burials in Britain – the notoriously misnamed “Red Lady of Paviland.”
In the field, Buckland had identified the skeleton as male, suggesting that the bones were those of a Customs Officer murdered by smugglers. By the time of publication later that year, however, the gender and age of the skeleton had changed with a new and better, but still erroneous, story.
Buckland, a devout Christian, believed no human remains could have been older than the Biblical Great Flood, and thus wildly underestimated its true age, believing the remains to date back to the Roman era. He believed the skeleton was female in large part because it was discovered with decorative items, including perforated seashell necklaces and ivory jewelry. These decorative items combined with the skeleton’s red dye caused Buckland to mistakenly speculate that the remains belonged to a Roman prostitute or witch. He later wrote in his book Reliquiae Diluvianae (Evidence of the Flood):
[I found the skeleton] enveloped by a coating of a kind of ruddle…which stained the earth, and in some parts extended itself to the distance of about half an inch [12mm] around the surface of the bones… Close to that part of the thigh bone where the pocket is usually worn surrounded also by ruddle [were] about two handfuls of the Nerita littoralis [periwinkle shells]. At another part of the skeleton, viz in contact with the ribs [were] forty or fifty fragments of ivory rods…[also]…some small fragments of rings made of the same ivory and found with the rods… Both rods and rings, as well as the Nerite shells, were stained superficially with red, and lay in the same red substance that enveloped the bones.
The “lady” has since been identified as a man, probably no older than 21, who lived about 26,000 years ago (26,350 ± 550 BP). It remains the first human fossil found and identified soon after its discovery and the oldest anatomically modern human remains found in the United Kingdom.
Buckland is also famous for being the first person to discover, name, and scientifically describe a fossilized creature that came to be recognized as what Richard Owen was to call a dinosaur. Buckland’s name for the animal was Megalosaurus, Greek for “great lizard”. Though he was not the first person to find a Megalosaurus bone (Robert Plot discovered a fossilized femur of one as far back as 1676), Buckland was the first to realize that these fossils belonged to an unknown class of huge reptiles. According to his calculations, the animal must have exceeded forty feet in length and weighed as much as a large elephant. Some people think his 1824 paper to the Geological Society of London (“Notice on the Megalosaurus or Great Fossil Lizard of Stonesfield”) inaugurated the modern study of dinosaurs.
Buckland’s interest in dinosaur remains included more than bones. He also carried out a large amount of research into fossilized dinosaur feces. At a meeting of the Geological Society of London on 6 February 1829, Buckland described them and introduced the term coprolites (from the Greek words “kopros”, meaning dung, and “lithos”, meaning stone). His paper, “On the Discovery of Coprolites, or Fossil Faeces, in the Lias at Lyme Regis”, states that they have “undergone no process of rolling, but retain their natural form, as if they had fallen from the animal into soft mud, and there been preserved,” later comparing them to “oblong pebbles or kidney-potatoes.”
Interestingly, Buckland was very eccentric. He caused such a stir with his explicit lectures on the mating habits of reptiles that The Times of London felt he should restrain his enthusiasm “in the presence of ladies”. He always wore his academic gown when out digging for fossils. The hallway of his Oxford home was lined with the skulls of animals. Monkeys, a bear (in a mortarboard) and a hyena, amongst other animals, had the run of the house (the hyena ate the family’s guinea pig).
But strangest of all was Buckland’s diet. He was a committed zoophagist — an eater of animals. All animals. In Buckland’s opinion, the Creator had placed the creatures of the world at Man’s service, to feed and clothe him and to be his companions, and it was Man’s duty to eat the rich bounty of foods provided by the Almighty for his sustenance. And eat them he did — from elephant trunk soup, panther chops, horse tongue, porpoise head, crispy mice in batter, kangaroo ham, and eland steaks to accidentally grilled giraffe (there had been a fire at the London Zoo). He found the taste of mole to be the worst, until he tasted bluebottles.
Once, while touring a church, the local vicar showed him “martyr’s blood” dripping from the rafters — Buckland dropped to his knees and began to lap at the miraculous liquid, which was, he announced between laps, bats’ urine. On a visit to Nuneham House, he was shown a silver casket holding what was reputed to be the heart of King Louis XIV of France. Before anyone could stop him, Buckland announced, “I have eaten many strange things, but have never eaten the heart of a king before,” before snatching it up and swallowing it.
Buckland’s eccentricities earned him a famous description by Charles Darwin, who wrote: “though very good-humoured and good-natured [he] seemed to me a vulgar and almost coarse man. He was incited more by a craving for notoriety, which sometimes made him act like a buffoon, than by a love of science.”
- Buckland, W. Reliquiae Diluvianae; or, Observations on the Organic Remains Contained in Caves, Fissures, and Diluvial Gravel, and on other Geological Phenomena, Attesting the Action of an Universal Deluge (London: John Murray, 1823).
- —————-”Notice on the Megalosaurus or great Fossil Lizard of Stonesfield“, Transactions of the Geological Society of London, series 2, vol. 1: 390-396 (1824).
- —————-“On the discovery of coprolites, or fossil faeces, in the lias at Lyme Regis, and in other formations“, Transactions of the Geological Society of London, series 2, vol. 3: 223–236 (1835).
On this date, Dian Fossey, an American primatologist who for years made a daily study of the mountain forest gorillas of Rwanda, central Africa, was born in San Francisco, California. Her strong interest in animals led her to enter college as a pre-veterinary student. However, she soon switched to occupational therapy and obtained her degree from San Jose State College in 1954.
But Fossey dreamed of seeing more of the world and its abundant wildlife. Therefore, in 1963, she took out a bank loan and began planning her first trip to Africa. Her trip included visits to Kenya, Tanzania (then Tanganyika), Congo (then Zaire), and Zimbabwe (then Rhodesia).
An experience that Fossey would later point to as a pivotal moment in her life was her visit to Olduvai Gorge in Tanzania. There, she met Dr. Louis Leakey, who encouraged her initial interest in gorillas.
I believe it was at this time the seed was planted in my head, even if unconsciously, that I would someday return to Africa to study the gorillas of the mountains.
Upon arriving home in Kentucky Fossey returned to work as an occupational therapist to repay the loan she had taken to pay for her trip to Africa … all the while dreaming of the day she would return.
There was no way that I could explain to dogs, friends, or parents my compelling need to return to Africa to launch a long-term study of the gorillas. Some may call it destiny and others may call it dismaying. I call the sudden turn of events in my life fortuitous.
In December 1966, Fossey was again on her way to Africa. She arrived in Nairobi, acquired the necessary provisions, and set off for the Congo. On the way, she made a stop to visit the Gombe Stream Research Centre to meet Jane Goodall and observe her research methods with chimpanzees. Eventually, Fossey moved her focus to Volcanoes National Park on the Rwandan side of the Virungas. On 24 Sept. 1967, she established and then directed the Karisoke™ Research Centre in Rwanda.
Little did I know then that by setting up two small tents in the wilderness of the Virungas I had launched the beginnings of what was to become an internationally renowned research station eventually to be utilized by students and scientists from many countries.
Living a solitary life for many years, Fossey observed the gorillas’ habits and gradually gained their acceptance. In 1970, she enrolled in the department of animal behavior at Darwin College, Cambridge, under Dr. Robert Hinde, who had also been Jane Goodall’s supervisor. She traveled between Cambridge and Africa until 1974, when she completed her Ph.D. Armed with the degree, she now felt that she could be taken more seriously. This also enhanced her ability to continue her work, command respect, and most importantly, secure more funding.
In 1980, Fossey moved to Ithaca, New York, as a visiting associate professor at Cornell University. She used the time away from Karisoke™ to focus on the manuscript for her book, Gorillas in the Mist. Published in 1983, the book is an account of her years in the rainforest with the mountain gorillas. Most importantly, it underscores the need for concerted conservation efforts. Praised by Nikolaas Tinbergen, the Dutch ethologist and ornithologist who won the 1973 Nobel Prize in Physiology or Medicine, the book was well received and remains popular to this day.
Fossey was brutally murdered in 1985, her attacker or attackers splitting her skull with a machete, the type commonly used by poachers. She was found in the bedroom of her cabin at Karisoke™ and had apparently tried to load her pistol during the attack. To this day her killer or killers have not been found.
There are de-classified diplomatic cables from Fossey’s time which indicate outright collusion between Melvin Payne, then President of the National Geographic Society, Secretary of State Cyrus Vance, and Rwandan Ambassador Frank Crigler to remove Fossey from Rwanda. A smear campaign was underway to discredit her so that money-making “conservation” schemes could be implemented by the African Wildlife Fund (AWLF) and the colonialist Mountain Gorilla Project.
Also, diplomatic cables and writing from that time indicate that higher ups realized Protais Zigiranyirazo, governor of Ruhengeri Province in Rwanda when Fossey worked there, was a likely suspect in Fossey’s murder. He was involved in illegal trading in endangered species and gold smuggling out of Congo, and there is much additional evidence in the historical record that Fossey was about to expose him when she was killed. Zigiranyirazo is now living in Abidjan, the capital of Ivory Coast.
Fossey was laid to rest in the graveyard behind her cabin, among her gorilla friends. The last entry in her diary read:
When you realize the value of all life, you dwell less on what is past and concentrate on the preservation of the future.
As Fossey’s legacy is reflected upon, it is clear that she significantly contributed both to science and conservation. Primatology benefited from her ability to endure many years of fieldwork and in turn reveal new knowledge concerning gorilla behavior, while primate conservation gained great momentum from the combination of Fossey’s bravery and ability to attract and hold the public’s attention.
- Dian Fossey, Gorillas in the Mist (Boston: Houghton Mifflin Company, 1983).
- “Fossey, Dian.” Complete Dictionary of Scientific Biography. 2008. Retrieved January 20, 2012 from Encyclopedia.com.
- “Dian Fossey murdered in Rwanda.” The CBC Digital Archives Website. Canadian Broadcasting Corporation. Last updated: March 25, 2009. [Page consulted on Jan. 20, 2012.]
- Farley Mowat, Woman in the Mists: The Story of Dian Fossey and the Mountain Gorillas of Africa (New York, NY: Warner Books, 1987).
- Georgianne Nienaber, Gorilla Dreams: The Legacy of Dian Fossey (Iuniverse.Com, 2006).
- —————— “Fox-Owned National Geographic Uses Gorillas as Cover for Exploitation of Congo” Huffington Post online, posted 15 July 2008, accessed 20 January 2012.
Systema Naturae was published, which is considered the starting point of zoological nomenclature; the oldest scientific names of animals accepted as valid today can be traced to this edition. Here, Linnaeus introduced the modern practice of using binomials for animal species, something he had done for plant species in the 1753 publication of Species Plantarum. Interestingly, in the first edition of Systema Naturae, the whales were erroneously classified as fishes; in the 10th edition, the whales were moved to the mammals.On this date, the tenth edition of Linnaeus’s
On this date, Samuel Latham Mitchill appeared in the packed chambers of the Mayor’s Court in New York City Hall as the star witness in the case of James Maurice v. Samuel Judd, a dispute arising under a New York State statute that obliged purveyors of “fish oils” to ensure that their casks had been inspected.
The facts of the case today seem boring. On March 31, 1818, the New York State Legislature passed a law to ensure the quality of fish oils, which were widely used in the tanning and preservation of leather at the time. The law called for a corps of inspectors to “seek out any parcels of fish oil” and to certify the amount of water, sediment, and pure oil each cask contained. It also stipulated that a fine of twenty-five dollars per cask be levied on any buyer of uninspected fish oil. Three months later, a certain Mr. Samuel Judd, owner of the New-York Spermaceti Oil & Candle Factory at 52 Broadway, bought three casks of “fish oil” that had not been “gauged, inspected, and branded, according to law.” Judd claimed he didn’t have to pay the required fine because he had purchased spermaceti, or whale oil, so James Maurice, a city inspector of fish oil, began proceedings to collect the fine.
Judd’s view reflected an intellectual quandary of his time: If a whale is a fish, then why is its tail horizontal rather than vertical? Why do whales not have scales? Why are whales warm-blooded, not cold-blooded like fish? Why do whales breathe air (that whales could drown was a proven fact by then), and give birth (and nurse their young with milk) rather than lay eggs? Why were whales so much smarter than lesser fish? (Apart from the challenge of their size was the challenge of their brains — whaling is hunting, not mere fishing.) And, perhaps most importantly, why did the insides of whales — which were known in the most minute detail as a simple commercial matter — resemble not the lesser fishes but rather cows and pigs?
However, to many zoologists of the time (but not all), the inside of a whale would have been totally irrelevant. [Interestingly, Linnaeus himself had said whales were fish in the 9th edition of the Systema Naturae, but formally separated them in the 10th edition, published only two years later in 1758.] In terms of what today is known as taxonomy, shape and environment were the categorical bases for grouping animals, not internal anatomy. Whales looked like fish (tails and blowholes notwithstanding) and lived where fish lived. The 1817 edition of a leading English dictionary defined fish simply as “an animal that lived exclusively in water”. Even Genesis clearly delineated creation by environment: “fish of the sea” (so, as a matter of elementary Judeo-Christian theology, oysters and crabs are “fish”), “fowl of the air” (bats?), and “every creeping thing that creepeth upon the earth.” Again, whales don’t creepeth upon the earth, so the notion that they are “animals” was fundamentally un-Christian and even bordered on blasphemy. Therefore, whales are fish.
Nevertheless, by 1818 zoologists had generally conceded that their field was far from complete and that debate and dissent about proper taxonomic classification was not only permissible but inevitable — especially as new species of just about everything kept being discovered. Moreover, the leading naturalists — particularly Samuel Latham Mitchill, a retired politician who also happened to be the preeminent authority on the fishes of New York and the founder of what would become the New York Academy of Sciences — aimed to convert taxonomy to a science of dissection: that species should be grouped together by how they looked on the inside rather than on the outside. Mitchill presented the Linnaean argument from anatomy: whales breathe air and have lungs, not gills; they have four-chambered hearts, like horses but unlike fish; their fins contain bones that are exact analogs of the hands and arms of apes and people; they even have eyelids that move. He famously remarked that “a whale is no more a fish than a man.”
Yet William Sampson, the lead prosecutor, challenged Mitchill at every turn, using arguments that have echoes in recent debates about Darwinian evolution. Was it not true, Sampson asked, that there was wide disagreement among scholars as to exactly how various animals should be classified? And what were common folk to make of the unlikely associations Linnaean taxonomy called upon them to make? Quoting Sampson:
Now, is not man strangely mated or matched when the whale and the porpoise are his second cousins, and the monkey and the bat his germans [close relations]? Other gentlemen may choose their company, [but] I am determined to cut the connection.
So what happened? After some wrangling about whether statutory interpretation should even be a question left to the lay jurors of a municipal trial court (a debate we sometimes have to this day), the judge charged the jury which, after only 15 minutes of deliberation, announced a verdict for the plaintiff. [However, within a month, the New York State Legislature essentially overturned the verdict by exempting whale oil from inspection — in the eyes of the law, the whale would no longer count as a fish.]
More than a century before Scopes, science was put on trial, and was convicted.
- D. Graham Burnett, Trying Leviathan: The Nineteenth Century New York Court Case that Put the Whale on Trial and Challenged the Order of Nature (Princeton University Press, 2007).
- Eric Jay Dolin, Leviathan: The History of Whaling in America (W.W. Norton, 2007) pp. 384-385.
On this date, the American vertebrate paleontologist and comparative anatomist Alfred Sherwood Romer was born. The Society of Vertebrate Paleontology, which Romer helped establish, says that he “was the leading contributor to the discipline of vertebrate paleontology throughout the twentieth century. . . Romer’s major contributions were in the areas of the ancestry of vertebrates, Paleozoic tetrapods, and the antecedents of mammals.” Perhaps Romer’s most notable gift to scientific posterity were his three seminal works: Osteology of the Reptiles (1956), Vertebrate Paleontology (1966), and The Vertebrate Body (1977) – immortal tomes which still adorn the shelves of any self-respecting student of vertebrate paleontology and evolution.
On this date, the English zoologist and chemist Edward Blyth was born in London. Although he was considered one of the leading zoologists in India, and a prominent figure overall in his field, he is best known for his early recognition of some of the principles of natural selection. In three articles on variation published in The Magazine of Natural History between 1835 and 1837, he discussed the effects of artificial selection and described the process in nature (later called natural selection) as restoring organisms in the wild to their archetype (rather than forming new species). Also, he never actually used the term “natural selection”.
Blyth believed that natural selection only preserves a constant and unchangeable type or essence of created form, by eliminating extreme variations or unfit individuals that deviate too far from this essence. Ernst Meyer wrote that:
Blyth’s theory was clearly one of elimination rather than selection. His principal concern is the maintenance of the perfection of the type. Blyth’s thinking is decidedly that of a natural theologian…
In fact, according to Stephen Jay Gould, natural selection was a common idea (but not a term) among biologists of the time, as part of the argument for created permanency of species. It was seen as eliminating the unfit, while some other cause created well fitted species. Blyth considered that species had “invariable distinctions” establishing their integrity, and therefore could not accept the formation of new species because if it occurred, “we should seek in vain for those constant and invariable distinctions which are found to obtain”. Blyth did not see the ramifications of the principle (nor did anyone else), and did little to develop his thoughts any further.
In contrast, Darwin introduced the idea that natural selection was creative in giving direction to a process of evolutionary change in which small hereditary changes accumulate. He did not read Blyth until after formulating his own theory.
Blyth remained a valued correspondent of Darwin’s after his formal publication of evolution by natural selection, and remained a strong friend of Darwin. Blyth was one of the first to embrace Darwinism, and was a vocal supporter for the remainder of his years.
Interestingly, Blyth’s writings had a major influence on Charles Darwin. There can be no doubt of Darwin’s regard for Edward Blyth – in the first chapter of The Origin of Species he wrote:
…Mr Blyth, whose opinion, from his large and varied stores of knowledge, I should value more than that of almost any one…
- de Beer, Gavin. Charles Darwin: Evolution by Natural Selection. (London: Thomas Nelson & Sons, 1963) p. 102.
- Gould, Stephen Jay. The Structure of Evolutionary Theory. (Cambridge, Massachusetts: Harvard University Press, 2002) pp. 137–141.
- Mayr, Ernst. The Growth of Biological Thought. (Cambridge, Massachusetts: Harvard University Press, 1984) p. 489.
On this date, a coelacanth (Latimeria chalumnae) was caught at the mouth of the Chalumna River on the east coast of South Africa. The fish was caught in a shark gill net by Captain Goosen and his crew, who had no idea of the significance of their find. They thought the fish was bizarre enough to alert the local museum in the small South African town of East London.
The director of the East London Museum at the time was Miss Marjorie Courtney-Latimer. She alerted the prominent south African ichthyologist Dr J.L.B. Smith to this amazing discovery. This modern coelacanth was eventually named in honor of Miss Courtney-Latimer.
This coelacanth specimen led to the discovery of the first documented population, off the Comoros Islands, between Africa and Madagascar. For sixty years this was presumed to be the only coelacanth population in existence. However, on July 30, 1998, a coelacanth was caught in a deep-water shark net by local fishers off the volcanic island of Manado Tua in northern Sulawesi, Indonesia, about 10,000 km east of the Western Indian Ocean coelacanth population. In 1999 the Sulawesi coelacanth was described as a new species, Latimeria menadoensis, by Pouyaud, Wirjoatmodjo, Rachmatika, Tjakrawidjaja, Hadiaty and Hadie.
In 1836, the eminent naturalist Louis Agassiz described the first fossil coelocanth. Since then, fossils of some 125 species have been discovered, dating back over 360 million years, with a peak in abundance about 240 million years ago. Before 1938, coelacanths were thought to have become extinct approximately 66 million years ago, when they disappeared from the fossil record, so the discovery of a living coelacanth was very significant.
But why are there no coelacanth fossils since the days of the dinosaurs? The explanation seems to be that the coelacanths from the fossil record lived in environments favoring fossilization, whereas modern coelacanths, both in the Comoros and Sulawesi, are found in environments that do not favor fossil formation. They inhabit caves and overhangs in nearly vertical marine reefs, at about 200 meters depth, off newly formed volcanic islands.
One of the most distinctive features of the coelacanth is that, along with all six living species of lungfishes but unlike all other fishes, it has paired “lobed fins”. The fins of such “lobe-finned fishes” project from the body on stalks rather than attaching directly to the body. The stalks that support the fins contain the same basic bones as the arms and legs of terrestrial four-limbed animals (tetrapods). Coelacanths even move their paired fins much like land animals move their limbs: The right pectoral fin moves in conjunction with the left pelvic fin, for example. And their movement is extremely dexterous; they scull the water like oars and can rotate through 180 degrees.
In fact, at the time of its discovery in 1938, the coelacanths were thought to be the ancestors of the tetrapods. Although it is now thought that the lungfishes are the closest living relative of tetrapods, the coelacanths may still provide answers to some very interesting evolutionary questions.
Other interesting features of the coelacanths include an intracranial joint and a rostral organ, not known in any other living fish.
- Samantha Weinberg. A Fish Caught in Time: The Search for the Coelacanth (Harper Perennial, 2001).
a gorilla was born in captivity for the first time in history. Born at the Columbus Zoo in Ohio and named Colo (a combination of Columbus and Ohio), the western lowland gorilla weighed four pounds. She was the daughter of Millie and Mac, two gorillas captured in French Cameroon, Africa, who were brought to the Columbus Zoo in 1951. For decades after people had first tried to keep gorillas in captivity, any gorilla’s path from the forest to the zoo was soaked in blood. The animals had to be captured in the wild when they were young — before they grew too big and powerful to handle. Hunters would first have to kill the baby’s parents and sometimes its entire family.On this date,
“She almost didn’t make it,” says Jeffrey Lyttle, author of Gorillas In Our Midst, a book about the Columbus Zoo gorillas.
“At the time, the zookeepers knew that Colo’s [mother] was pregnant, but nobody knew the gestation period of a gorilla,” Lyttle recalls. “They thought it was nine months, like humans, but it turns out it is closer to eight and a half months. So they weren’t expecting the birth. A vet named Warren Thomas was making his morning rounds when he discovered Colo, in her amniotic sack, lying on the concrete floor of her mother’s cage. He reached in, tore open the sack, and began giving Colo mouth-to-mouth resuscitation.”
Luckily, the little gorilla lived. “It was huge national news,” says Lyttle. But zookeepers believed that Colo’s mother wasn’t up to the task of raising her baby. They were probably right, since many captive gorillas never had a chance to learn parenting skills from their own parents in the wild. “So Columbus built a special nursery for her,” Lyttle explains. “Zoo visitation went through the roof. They would dress Colo up for the holidays — put her in an Easter bonnet and fancy dresses. Some people say she still likes to wear her food dish as a hat because she spent so much of her infancy wearing hats.”
Colo is also the oldest living gorilla in captivity, following the death of 55 year old Jenny in September 2008.
On this date, the American geologist Joseph Barrell was born. He was professor of structural geology at Yale University from 1908 until his death in 1919.
Barrell proposed that sedimentary rocks were produced not only by marine sedimentation but also by the action of rivers, winds, and ice (continental sedimentation).
He also proposed (1916) that the bright red color of many Devonian rocks meant that the rocks had been baked dry, like bricks, in arid conditions. [Barrell had been only half right; red rocks do sometimes form in droughts, but they form in moist tropical soils as well.]
Barrell, and subsequently the American paleontologist Alfred Sherwood Romer, speculated that droughts had caused lungfish to evolve into air-breathing land vertebrates, including tetrapods. According to this hypothesis, as the ponds dried, the fish had to adapt to life on land and so evolved features that enabled them to hop from pond to pond. [However, evidence discovered more recently suggests that the fish-to-tetrapod transition likely happened not in creatures that were adapting to land but in creatures living in water. In fact, everything special about tetrapods – limbs, digits, ribs, neck, and so on – might well have evolved in water, not on land.]
At a meeting of the Geological Society of America held in Albany, New York, in 1916 Barrell presented a paper on “Rhythms and the measurement of geologic time” that was later published in full in the Society’s Bulletin in 1917. The article became an instant classic in geology. Barrell argued that geological processes vary in intensity in a cyclical rather than a uniform fashion. Thus, current rates of geological change could not, as uniformitarians claim, be a reliable guide to the past. He suggested that the new radiometric dates should be used to interpret the sedimentological record. Thus, he accepted an age for the Earth of a few billion years at a time when many geologists still preferred an age of 100 million years.
Nature vibrates with rhythms, climatic and diastrophic [tectonic], those finding stratigraphic expression ranging in period from the rapid oscillation of surface waters, recorded in ripple-mark, to those long-deferred stirrings of the deep imprisoned titans which have divided earth history into periods and eras. The flight of time is measured by the weaving of composite rhythms- day and night, calm and storm, summer and winter, birth and death such as these are sensed in the brief life of man. But the career of the earth recedes into a remoteness against which these lesser cycles are as unavailing for the measurement of that abyss of time as would be for human history the beating of an insect’s wing. We must seek out, then, the nature of those longer rhythms whose very existence was unknown until man by the light of science sought to understand the earth. The larger of these must be measured in terms of the smaller, and the smaller must be measured in terms of years. Sedimentation is controlled by them, and the stratigraphic series constitutes a record, written on tablets of stone, of these lesser and greater waves of change which have pulsed thru geologic time. ["Rhythms and the Measurements of Geologic Time", Bulletin of the Geological Society of America (1917) 28: 746]
Although Barrell’s concerns were seemingly diverse, they were actually variations on a common theme: the effects of physical agents on the evolution of the Earth and its inhabitants. Thus, “The Origin of the Earth” (1916), a lecture delivered to Yale’s Sigma Xi Society, discussed the conditions required for the genesis of the solar system and the development of the Earth; Barrell’s papers on sedimentology always related sedimentological processes to the larger problems of historical geology, as did his treatments of structural geology; he maintained that biological evolution was the result of physical and chemical agents, in that these are the factors determining the environment of organisms.
- Joseph Barrell, “Rhythms and the Measurements of Geologic Time” Geol. Soc. America Bull. (1917) 28: 745-904.
- Patrick Wyse Jackson, The Chronologers’ Quest: The Search for the Age of the Earth (Cambridge, UK: Cambridge University Press, 2006) 195-6.
On this date, the Russian founder of comparative embryology and experimental histology Aleksandr Onufriyevich Kovalevsky was born. He was the first to establish that there was a common pattern in the embryological development of all multicellular animals.
Kovalevsky began by studying the lancelet, a fish-shaped sea animal about 2-in. (5-cm) long; he then wrote Development of Amphioxus lanceolatus (1865). In 1866, he demonstrated the similarity between Amphioxus and the larval stages of tunicates and established the chordate status of the tunicates. In 1867, Kovalevsky extended the germ layer concept of Christian Heinrich Pander and Karl Ernst von Baer to include the invertebrates, such as the ascidians, establishing an important embryologic unity in the animal kingdom. This was important evidence of the evolution of living organisms. In the Descent of Man (1871), Charles Darwin took serious note of Kovalevsky’s interpretation of the embryonic development of ascidians, writing:
M. Kovalevsky has lately observed that the larvae of the Ascidians are related to the Vertebrata in their manner of development, in the relative position of the nervous system and in possessing a structure closely like the chorda dorsalis of vertebrate animals; and in this he has since been confirmed by Prof. Kupffer. M. Kovalevsky writes to me from Naples, that he has now carried these observations further; and, should his results be well established, the whole will form a discovery of the greatest importance. Thus if we may rely on embryology, ever the safest guide in classification, it seems that we have at last gained a clew in the source whence the vertebrates were derived. I should then be justified in believing that at an extremely remote period a group of animals existed, resembling in many respects the larvae of our present ascidians, which diverged into two great branches – the one retrograding in development and producing the present class of Ascidians, the other rising to the crown and summit of the animal kingdom by giving birth to the Vertebrata.
Kovalevsky was elected to the Russian Academy of Sciences in 1890.
Charles Darwin had finally completed his descriptions of the Beagle specimens, except for one species of barnacle. He was anxious to return to his work on transmutation (evolution), and thought he could quickly finish a description of this barnacle. Instead, the study of this barnacle exploded into one of the most intense research projects of his career, lasting nearly eight years and resulting in four volumes on living and fossil Cirripedes (barnacles). For his observations, he had a single lens microscope made to his own specifications. Intended to be more practical than the Beagle microscope, it did not have fine focusing and had a larger stage in order to take shallow dishes for aqueous dissections.Ten years after his voyage on HMS Beagle,
On this date, the American embryologist and geneticist Thomas Hunt Morgan was born in Lexington, Kentucky. At Columbia University (1904-28), he began his revolutionary genetic investigations of the fruit fly Drosophila melanogaster (1908). In 1910, he discovered a white-eyed mutant in Drosophila. At that time, it was generally assumed that chromosomes could not be the carriers of the genetic information. Initially skeptical of Gregor Mendel’s research, Morgan performed rigorous experiments eventually demonstrating that genes are linked in a series on chromosomes and are responsible for identifiable, hereditary traits. When he was awarded the Nobel Prize in Physiology or Medicine in 1933, he was the first person awarded the Prize for genetics, for demonstrating hereditary transmission mechanisms in D. melanogaster.
HMS Beagle spent this day in the Galapagos Archipelago surveying the waters around Charles Island, which was populated by a small colony of about 250 political prisoners from the Republic of Equator (established in 1829). Darwin went on shore with Covington to collect plants and birds and climbed the highest hill — about 1,800 feet above sea level. He also examined a few curious lava chimneys. During his stay on the island, Darwin was informed by Mr. Nicholas Lawson, an Englishman in charge of the prison colony, that one can tell which island a tortoise came from by looking at its shell.
Later, when Darwin was completing his ornithological notes some time between mid-June and August 1836, he wrote:
When I recollect the fact, that from the form of the body, shape of scales & general size, the Spaniards can at once pronounce from which Isd. any tortoise may have been brought: — when I see these Islands in sight of each other and possessed of but a scanty stock of animals, tenanted by these birds but slightly differing in structure & filling the same place in Nature, I must suspect they are only varieties. The only fact of a similar kind of which I am aware is the constant asserted difference between the wolf-like Fox of East & West Falkland lsds. — If there is the slightest foundation for these remarks, the Zoology of Archipelagoes will be well worth examining; for such facts would undermine the stability of species.
The first stirrings of doubt about the immutability of species had evidently struck Darwin by now.
- Barlow, Nora ed. 1963. Darwin’s ornithological notes. Bulletin of the British Museum (Natural History). Historical Series Vol. 2, No. 7, p. 262.
On this date, the English ornithologist John Gould was born. His identification of Charles Darwin’s finches was pivotal in the development of the theory of evolution presented in The Origin of Species.
When Charles Darwin presented his mammal and bird specimens collected during the voyage of HMS Beagle to the Geological Society of London at their meeting on January 4, 1837, the bird specimens were given to Gould for identification. He set aside his paying work and at the next meeting on January 10 reported that birds from the Galápagos Islands which Darwin had thought were blackbirds, “gross-bills”, and finches were in fact “a series of ground Finches which are so peculiar” as to form “an entirely new group, containing 12 species.” This story made the newspapers.
In March, Darwin met Gould again, learning that his Galápagos “wren” was another species of finch and the mockingbirds he had labelled by island were separate species rather than just varieties, with relatives on the South American mainland. Subsequently Gould advised that the smaller southern Rhea specimen that had been rescued from a Christmas dinner was a separate species, which he named Rhea darwinii, whose territory overlapped with the northern Rheas.
Darwin had not bothered to label his finches by island, but others on the expedition had taken more care. He now sought specimens collected by Captain Robert FitzRoy and crewmen. From them he was able to establish that the species were unique to the islands, an important step on the development of his theory of evolution. Gould’s work on the birds was published as Part 3 of The Zoology of the Voyage of HMS Beagle, under the Command of Captain FitzRoy, during the Years 1832 to 1836, edited by Charles Darwin and published in five volumes between 1838 and 1842.
During his life, Gould produced 41 lavishly illustrated volumes on birds from all over the world, containing in all about 3,000 plates, all lithographed and hand-painted. Of these, his Birds of Australia was particularly significant (1840-69) as the first comprehensive record of the continent’s birds and mammals. With its plates of the birds were descriptions and notes on their distribution and adaptation to the environment.