Includes index and bibliographical footnotes [Critical phase. Critical period in Mammalia. Critical unit ovulation in mammals. Length of gestation and causes of birth in man and mammals. Lactation. Menstruation. Abortions. Cause of birth. Rhythm of reproduction. Corpus luteum. Extinction of marsupials. Trophoblast. Placenta. Evolution of egg-capsule]. M.3.-
The Span of Gestation And the Cause of Birth : a Study of the Critical Peri...
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