Natural scientist who formulated the theory of evolution, a highly controversial stance that challenged the established norms of science and religion. ALS signed 'Ch. Darwin,' one page, 5 x 8, personal letterhead, October 24. Letter to an unidentified gentleman. In part, 'Pray thank Prof Reichenbach for his good kindness. I am sorry that younand he have had to trouble for a plant I knew was afterward discovered in flower and was sent to me.' In fine condition, with light mailing folds and a touch of light toning. COA John Reznikoff/PSA/DNA and RRAuction COA.