''When on board H.M.S 'Beagle', as naturalist, I was much struck with certain facts in the distribution of the inhabitants of South America, and in the geological relations of the present to the past inhabitants of that continent. These facts seemed to me to throw some light on the origin of species- that mystery of mysteries, as it has been called by one of our greatest philosophers.
On my return home, it occurred to me, that something might perhaps be made out of the question by patiently accumulating and reflecting on all sorts of facts which could possibly have any bearing it. After five years' work I allowed myself to speculate on the subject, and drew up some short notes...''
(From the book by the same name by Charles Darwin)
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