Abstract
IT is generally believed among mammalian embryologists that during the life of the individual there is no increase in the number of primary oocytes beyond those originally laid down when the ovary was formed. This idea has grown from two sources of evidence—one, from the Weismannian doctrine of the germ-plasm; the other, from the fact that it is difficult to find any evidence for post-natal formation of new oocytes by metamorphosis of any non-germinal ovarian cell.
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