A Confidential Concept

#OTD Today, in 1857, Harvard botanist Asa Gray received a confidential letter from Charles Darwin.

In the letter, Darwin wrote:
"I will enclose the briefest abstract of my notions on the means by which nature makes her species...I ask you not to mention my doctrine."
Two years later, Darwin revealed his concept of natural selection in his book, "On the Origin of Species.

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Asa Gray
Asa Gray