T W O FIQURES
INTRODlJCTIONThe recent work of Evans, Burr, and Althausen ('27) upon the histopathology of gestation in the rat deprived of vitamin E is of sufficient importance to justify further investigation. This study, therefore, was undertaken in order to extend our knowledge of this deficiency. I wish to thank Dr. Jennings C. Litzenberg, .Dr. C. M. Jackson, and Dr. George 0. Burr for their advice and criticism during the course of this investigation.
MATERIAL AND METHODSThe material consisted of ninety-one female albino rats, bred from normal adult Wistar stock and reared in the animal colony of the Department of Anatomy, University of Minnesota. The young rats were weaned on their twentyfirst day of life and were given a basal diet (Burr no. 561) composed of: casein (crude), 30.0; sucrose, 45.0; salts (McCollum no. 185), 4.5, and lard, 20.0. I n addition, each animal was individually fed 0.6 gram of powdered yeast and three drops of cod-liver oil each day. The rats were weighed at five-day intervals, and, when fifty days of age, vaginal smears were taken to establish their estrous behavior.The first breeding was carried out at seventy-five days of age. A positive breeding was recorded when sperm were 175
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