Species, appeared in the "Annals of Natural History" in 1855. Its resultant conclusion was "that every species has come into existence coincident both in space and time with a preexisting closely allied species." Mr. Darwin tells us that Mr. Wallace wrote him that the cause to which he attributed this coincidence was no other than "generation with modification," or in other words that the "closely allied ante-type" was the parent stock from which the new form had been derived by variation.
Mr. Wallace's second paper, which in my judgment is the clearest and best condensed statement of the Doctrine of the Struggle for Existence and the principle of Natural Selection ever written, was written by Mr. Wallace at Ternate in the Malay Archipelago, in February, 1858, and sent to Mr. Darwin. It was called "On the Tendency of Varieties to Depart Indefinitely from the Original Type." Mr. Wallace requested Mr. Darwin to show it to Sir Chas. Lyell, the father of Modern Geology, and accordingly Dr. Hooker, the great botanist, brought it to Sir Chas. Lyell. They were both so struck with the complete agreement of the conclusions of Mr. Darwin and Mr. Wallace that they thought it would be unfair to publish
