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In his letter Crick considered the role of chance and the possibility of choice in evolution. The evolutionary phenomenon to which Crick was referring was the symbiosis of microorganisms, as in the phagocytosis (the engulfing) of bacteria by prokaryotes, primitive cells without a clearly defined nucleus.
Original Repository:
The Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers
Location:
Box: 12. Folder: PP/CRI/D/1/2/7
Rights:
Reproduced with permission of the Wellcome Library for the History and Understanding of Medicine. and http://library.wellcome.ac.uk/
Original Repository. Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers. 11646. URL. http://archives.wellcome.ac.uk/