A Trove of Darwin's Correspondence Is Published Online

Charles Darwin

Wikimedia Commons

Charles Darwin in 1854.

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Wikimedia Commons

Charles Darwin in 1854.

Early in 1844, a year into what became a four-decade correspondence, Charles Darwin wrote Joseph Dalton Hooker a letter—one of some 1,200 they exchanged over the course of their friendship.

"At last gleams of light have come, & I am almost convinced (quite contrary to opinion I started with) that species are not (it is like confessing a murder) immutable," he wrote to Hooker on January 11. "I think I have found out (here's presumption!) the simple way by which species become