into a human being. The earliest contributions to the field came mainly from philosophers, psychologists, and sociologists who were intrigued with the problem but who had little other than their own insights and observations upon which to base their explanations. With the development of experimental psychology, interest in the scientific study of child development began both in Europe and America. This fact, coupled with the growth of public interest in child-rearing, gave rise to the establishment' of a number of childwelfare research stations and child-
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William H. Sewell (1963) studied this question.