October 1, 1846 (a Thursday)

Charles Darwin by G Richmond.

Ten years after his voyage on HMS Beagle, 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.

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