Abstract
Summary
Following protracted injection in 16 rabbits of gonadotropic hormone derived from different sources we succeeded in one case in producing a progonadotropic serum, after treatment consisting of daily injections for a period of 5 months. 0.025 cc of this serum was able to multiply by 8 the gonadotropic effect of an aqueous extract of rat pituitaries, Control experiments showed that this augmentary effect was specific: it was neither obtained with normal serum acting on extracts of the rat pituitary, nor with progonadotropic serum acting on gonadotropic hormones of a different origin, Viz., of human pituitaries.
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