*
Because of the difficulties of international communication the authors have not read proof of this article.
†
This investigation has been aided by a grant from The Jane Coffin Childs Memorial Fund for Medical Research, and the Rockefeller Foundation. Alpha-estradiol was generously supplied by Dr. Karl Miescher and Dr. C. Oppenheimer, of Ciba Pharmaceutical Products. Progesterone was obtained through the kindness of Dr. M. Tausk, of Organon, Holland.
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©1944 American Association for Cancer Research.
1944
The International Cancer Research Foundation
