1This Address is based on the Joseph Price Oration delivered by Mr Blaikley at the seventy-fifth Annual Meeting of the American Association of Obstetricians and Gynecologists, September 10-12 1964, and published in the American Journal of Obstetrics & Gynecology. The Honorary Editors are grateful to the editor and publishers for permission to use material from that journal, including Figs 1, 2 and 4
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