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- From the Child Development Unit, Department of Pediatrics, University of Louisville. Based on a paper Tead at the 33rd annual conference of The Milbank Memorial Fund on “The Nature and Transmission of the Genetic and Cultural Characteristics of Human Populations.” The author is Markle Scholar in medical science. He is indebted to Mr. Frederick Osborn and Professor Alex Steigman for encouragement and to Dr. Wilton Krogman and Dr. J. M. Tanner for constant stimulation.