. Fig. 30—Same as Fig-. 29, showing a different type of Placental Crypts with thickened, fibrous partitions possibly due to prior disease remain. There is constant peril to the embryo from bacte- ria, already old habitants of the utero-cervical cavity, and there is a further threat of unknown potentiality from micro-organisms floating in the blood of the mother, which may invade the uterus from the blood stream. Thejie dan-

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Keywords: ., bookauthorwilliams, bookcentury1900, bookdecade1920, bookyear1921