Study supported in part by a grant from the Research Council of the University of Massachusetts.

Based on PhD thesis submitted to Brown University (June 1967).

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.

Research conducted at Fels Research Institute and supported in part by grants HD-00868, FR-00222, and FR-05537 from the National Institute of Mental Health.

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