Abstract
In mature follicles from sows in estrus, the cells of the theca interna are rich in phosphatase but the cytoplasm of the granulosa cells has none. The same is true after ovulation and in the development of the corpus luteum. Nearly mature follicles of a bitch in estrus are identical with those of the sow. Mature rabbit follicles 9 hrs. after mating have considerable phosphatase in the granulosa but none in the theca interna. The lutein cells are loaded with enzyme. A follicle of the rhesus monkey 24 hrs. after ovulation showed considerable enzyme in the theca and granulosa. In the early human embryo theca cells contain the enzyme only up to a day or two after ovulation.

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