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).
"Oh, good heavens, the relief to my head and body to banish the whole subject from my mind!... But, alas, how frequent, how almost universal it is in an author to persuade himself of the truth of his own dogmas. My only hope is that I certainly see many difficulties of gigantic stature."
1860:
Publication of the second edition of the "Origin" (3000 copies).
Publication of a "Naturalist's Voyage".