One of the most interesting questions presenting itself to the investigator, and which has been surrounded with the deepest mystery, is that of the vital processes of the reproduction of animal life. From the earliest periods of medicine may be traced the results of observation and the deductions therefrom which have given rise to speculative theories and beliefs.
Fabricius1 made careful studies of the placenta. He demonstrated that the placenta varied in position, shape, and size in mammals, laying emphasis on the form of a placenta found in the human animal. He concluded that the single placenta found in the human female, the mouse, the rabbit, the guinea-pig, the dog and the cat, is associated with the presence of incisor teeth in both jaws and with distinct toes. When the placenta is found multiple, as in the sheep, the cow, and goat the incisors are present in one jaw
MARCY HO. THE HISTOGENESIS OF THE REPRODUCTIVE PROCESSES IN MAMMALS. JAMA. 1915;LXV(10):856–859. doi:10.1001/jama.1915.02580100020005
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