The effects of extracts of testis in correcting the castrated condition in the fowl and in the mammal.

C. R. Moore, T. F. Gallagher, and F. C. Koch were the first to obtain a potent testicular extract containing the male sex hormone, androsterone, later obtained in crystalline form by Butenandt. They also gave a detailed account of the capon-comb test for the assay of the male hormone.