the consumption of so much time."

"From September 1854 I devoted my whole time to arranging my huge pile of
notes, to observing, and to experimenting in relation to the transmutation
of species."

1856:

"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'."

1858:

Joint paper by Charles Darwin and Alfred Russel Wallace "On the Tendency of
Species to form Varieties; and on the perpetuation of Varieties and Species
by Natural Means of Selection," communicated to the Linnean Society by Sir
Charles Lyell and Sir Joseph Hooker.

"I was at first very unwilling to consent (to the communication of his MS.
to the Society) as I thought Mr Wallace might consider my doing so
unjustifiable, for I did not then know how generous and noble was his
disposition."

"July 20 to Aug. 12 at Sandown (Isle of Wight) began abstract of Species
book."

1859:

Nov. 24. Publication of "The Origin of Species" (1250 copies).