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Carnegie Human Embryo Collection Becoming a Science Franklin P. Mall Exceptional Scientist Staging Expansion New Direction Molecular New Era |
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Members of the Department of Embryology, 1939. George Streeter is second from the right in the first row. |
Already by the 1930's, the research at the department was changing. Streeter had started a rhesus monkey colony there in the 1920s, not only to add a comparative dimension to the study of early embryos but to provide a basis for the study of primate and human reproductive physiology. Soon, the latter effort became paramount. In part this was inevitable. As the the embryologists sought younger and younger embryos, it was only natural to reach a point where conception and early development overlapped. Questions about ovulation and menstruation were still unsettled. The role of hormones was just being discovered. Indeed, it was only in 1930 that the ripened human egg was first observed coming from the ovary. |