Development of Darwin's theory

In January 1842 Darwin sent a tentative description of his ideas in a letter to Lyell, who was then touring America. Lyell, dismayed that his erstwhile ally had become a Transmutationist, noted that Darwin "denies seeing a beginning to each crop of species". Illness was a continuing problem, and as his books on Coral Reefs and Fish reached print he and Emma left London on 18 May, visiting her parents at Maer Hall then moving on to Shrewsbury on 15 June for rest and quiet. Here Darwin formulated a 35 page '"Pencil Sketch"' of his theor ...

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