Excerpt from The Foundations of the Origin of Species: A Sketch Written in 1842
It is impossible to know how soon the ferment of uniformitarianism began to work, but it is fair to suspect that in 1832 he had already begun to see that mutability was the logical conclusion of L... yell's doctrine, though this was not acknowledged by Lyell himself.
There were however other factors of change. In his Autobiography1 he wrote - During the voyage of the Beagle I had been deeply impressed by dis covering in the Pampean formation great fossil animals covered with armour like that on the existing armadillos; secondly, by the manner in which closely allied animals replace one another in proceeding southward over the Continent; and thirdly, by the South American character of most of the productions of the Galapagos archipelago, and more especially by the manner in which they differ slightly on each island of the group; none of the islands appearing to be very ancient in a geological sense. It was evident that such facts as these, as well as many others, could only be explained on the supposition that species gradually become modified; and the subject haunted me.
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