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In his letter Crick called for "constructive approaches" to research on the interaction of heredity and environment in the formation of intelligence, an issue brought to the forefront of public debate in the late 1960s by the writings of William Shockley and Arthur Jensen. In particular, Crick called for more research on identical twins separated at birth.
Original Repository:
The Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers
Location:
Box: 22. Folder: PP/CRI/D/2/14
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/