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The work on the inheritance of extraversion-introversion reported here was carried out by Drs. D. B. Blewett and H. McLeod and the details are recorded in their Ph.D. theses (1, 14.) The results of that part of the study dealing with intellectual functions have been reported elsewhere by Dr. Blewett2. A detailed account of the whole experiment, with particular reference to the non-cognitive factors, has been given by the writer7. The research was generously aided financially by the Eugenics Society.