Charles Darwin, English naturalist, c 1860s.
© Science Museum / Science & Society Picture Library
Remarque proof etching by W W Oules after an earlier work by P Rajon. Darwin (1809-1882), a British naturalist and the originator of evolutionary theory, was employed as a naturalist on HMS Beagle from 1831 to 1836. He first made his name as a geologist, but is remembered for his momentous contributions to biology. His most famous work, 'The Origin of Species by Means of Natural Selection', was published in 1859.