In 1831, the twenty-two-year oldCharles Darwinembarked on the Royal Navy ship H.M.S.Beagleas it set off on what was to be a five-year-long surveying expedition around South America and across the Pacific. Darwin was employed officially as a naturalist and geologist to assist in the survey, but unofficially as a companion to the captain, Robert Fitz Roy.
Darwin was a keen and intelligent observer, and made a number of discoveries on the...