On 24th August 1831, Charles Darwin’s great friend and mentor John Stevens Henslow sat down at his desk, took up his pen, and wrote what turned out to be one of the most important letters in the history of science.
On 24th August 1831, Charles Darwin’s great friend and mentor John Stevens Henslow sat down at his desk, took up his pen, and wrote what turned out to be one of the most important letters in the history of science.