Galton Lecture: Behaviour genetic studies of intelligence, yesterday and today: the long journey from plausibility to proof

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Abstract
When asked whether he would discuss man in theOrigins of the Species, Darwin replied, ‘I think I shall avoid the subject, as so surrounded with prejudices, though I fully admit it is the highest and most interesting problem for the naturalist’. Galton on the other hand replied to the same question, ‘I shall treat man and see what the theory of heredity of variations and the principles of natural selection mean when applied to man’ (Pearson, 1914–30, Vol. II, p. 86).