Darwin read this volume, which accepted the principle of extremely slow geological change, and presented a classic explanation of geological developments taking place over millions of years, during the initial phases of the voyage of the Beagle, which departed on its circumnavigation in November 1831. The second volume, which contained extensive discussion of the geographical distribution of species, ancient and modern, including speculations on their transmutation, caught up with him in Montevideo in October 1832.
These content of the first volume, in particular, resonated with the geological tour that Darwin had made with Adam Sedgwick, Professor of Geology at Cambridge, shortly before the departure of the Beagle. As a result, during the voyage Darwin largely considered himself a geologist, specialising in rocks and fossils, collecting botanical and faunal specimens as a supplementary interest.
The powerful long-term influence of Charles Lyell's Principles of Geology is seen in Darwin's later admission to Leonard Horner, Lyell's father-in-law:-
"I always feel as if my books came half out of Lyell's brains & that I never acknowledge this sufficiently, nor do I know how I can, without saying so in so many words for I have always thought that the great merit of the Principles, was that it altered the whole tone of one's mind & therefore that when seeing a thing never seen by Lyell, one yet saw it partially through his eyes. The Theory of Evolution, (as considered to be applicable to Humanity), has traditionally tended to focus on the physical.At the end of this page's extensive, (and hopefully authoritative, informative and entertaining), review of the History of Evolutionary Theory, however, there is some further content related to consideration of innate "Human Nature".These reliable sources of evidence include ~ Modern Psychological Science ~ and perhaps even more importantly, such undoubted spiritual, philosophical and literary authorities
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