TLDR
MAY 1856 TO JUNE 1858.
[In the Autobiographical chapter (page 69,) my father wrote:—"Early in 1856 Lyell advised me to write out my views pretty fully, and I began at once to do so on a scale three or four times as extensive as that which was afterwards followed in my 'Origin of Species;' yet it was only an abstract of the materials which I had collected." The letters in the present chapter are chiefly concerned with the preparation of this unfinished book.via the TL;DR App
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Written by charlesdarwin | On the Origin of Species By Means of Natural Selection
