Results/Conclusions Darwin's presence on the Beagle resulted from three main contingencies. a) As member of a wealthy English family, he was a candidate to accompany the aristocrat Robert Fitzroy in this five-year trip. b) After arriving at Cambridge he befriended Professor John Henslow, who recommended him to Fitzroy. c) Fitzroy's favorite for the post renounced unexpectedly. Moreover, Darwin's father was instrumental by financing his expeditions on land. Darwin's Chilean experience was largely geological. He missed some peculiarities of the Chilean flora and fauna that could have contributed to his theory. Darwin's first publication ("Proofs of recent elevation on the coast of Chile", 1838) argued for the gradual build up of the massive Andes that so much impressed him. These observations suggested to him that the history of Earth was longer than previously conceived. A most important direct contribution was the monograph on the Cirripedia, a “most curious form” found in the coast of Chile, that “was of considerable use to me, when I had to discuss in The Origin of Species the principles of a natural classification” (Autobiography). Darwin's passing through Chile yet often overlooked by his biographers lasted 13 months, and provided many crucial observations for his theory.