Preparation of this paper supported by U.S. Public Health Grant HD-0890, a grant from the Carenegie Corporation, and by U.S. Public Health Grant HD-2680.

Study supported by research grant 1-K03-Hd36971 and by training grant 1-T01-Hd00203 from the National Institute of Child Health and Human Development.

Research supported by grant APA-178 from the National Research Council of Canada.

Paper, revised for publication, presented at a Symposium on Heredity and Environment (AERA, New York City, Feb. 16, 1967)

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