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26<br />
CHARLES DARWIN AND THE ORIGIN OF SPECIES<br />
Azores, the mid-Atlantic off the coast of Portugal (September), and<br />
back to Falmouth, England, on 2 October. Most of the voyage was<br />
spent in and around South America, forty-two out of fifty-seven<br />
months; nonetheless, Darwin saw a significant portion of the world.<br />
He returned to England a changed man. ‘‘Why, the shape of his head<br />
is quite altered,’’ exclaimed his father when he first saw Darwin, adding<br />
a phrenological explanation to the maturity he perceived. 28<br />
The change in Darwin was not difficult to explain. During the<br />
voyage, he had become a scientist. Although Darwin did not recognize<br />
it at the time, this process began when he started a daily journal.<br />
At first he was self-conscious about putting his observations and<br />
reflections on paper, but he found that writing in the journal helped<br />
him to make sense of each day’s events: he started a habit that he<br />
would continue for the rest of his life. One day he read parts of the<br />
journal to FitzRoy who was impressed by the detail of Darwin’s<br />
observations. FitzRoy suggested that the journal was worth publishing<br />
and the compliment made Darwin even more careful about<br />
observing his surroundings and recording what he encountered. The<br />
edited version of the journal was published as Journal of Researches<br />
into the Geology and Natural History of the Various Countries Visited<br />
by the H.M.S. Beagle (1839). And Darwin’s observations of the geology<br />
of the places he visited were published in three books: The<br />
Structure and Distribution of Coral Reefs (1842), Geological Observations<br />
on the Volcanic Islands, Visited During the Voyage of H.M.S. Beagle,<br />
together with some Brief Notices on the Geology of Australia and<br />
the Cape of Good Hope (1844), and Geological Observations on South<br />
America (1846). The books formed three parts of a series Darwin titled<br />
‘‘The Geology of the Voyage of the Beagle.’’<br />
Darwin also wrote a large number of letters. He wrote to his father,<br />
sisters, and cousins, the Wedgwoods, who found his adventures<br />
fascinating. He wrote to Henslow, who read some of the letters to the<br />
Philosophical Society of Cambridge on 16 November 1835 and<br />
arranged to have them printed so that other members of the Society<br />
could read them. He also wrote to naturalists such as Thomas Campbell<br />
Eyton (1809–1880) and Frederick William Hope (1797–1862).<br />
By the time Darwin returned home, his adventures were already well<br />
known: his family, former professors, and interested naturalists had<br />
seen to this.<br />
Most important, Darwin observed, collected, and analyzed. At<br />
Punta Alta, in Argentina, Darwin discovered seven sets of fossil<br />
bones, including the head and a tooth of two Megatherium, a giant<br />
mammal related to present-day armadillos. This discovery and other<br />
fossil bones that Darwin sent back to England ‘‘excited considerable