Abstract
While extensive work has been done with, pituitary implants in female rats and mice very little has been published on the male mammal. In contrast with the great follicular development in the ovary there has been little change reported in the histology of the testis after pituitary implants. Smith and Engle (1) showed an increased size of the male reproductive organs exclusive of the testes in young rats and mice but in adnlt male rats no effect of implants was seen. Pituitary implantation into ground squirrels was begun in this laboratory in 1929 and has continued to 1932 in both sexes and to 1933 in the male. In 1931 Johnson and Wade (2) reported a change from primary spermatocyte spireme stages to actively dividing spermatocyte divisions and spermatids as a result of eight daily implants of rat pituitaries into each of two males. Microphotographs showed these changes and indicated an increase in size of the tubules. A procedure of taking a sample of one testis before the implants were made was describe...
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