Abstract
The author has studied the occurrence of periodic-acid-Schiff-positive materials in the vaginal and cervical epithelia of albino rats. The Müllerian ducts first lack periodic-acid Schiff-positive substances; later there occurs a storing of glycogen in the Müllerian epithelium In immature animals the glycogen is gradually replaced by saliva resistant periodic-acid-Schiff-positive materials. It adult animals glycogen has been found in the stratified cervical epithelium only in proestrus and early estrus.