Materials on the relationship between hormones and extracts from endocrine glands

In the fall of 1924, at the suggestion of Prof. N.A. Mislavsky, I began an experimental study of the interaction of some hormones and extracts from endocrine glands. We wanted to find out: 1) whether a synergistic hormone, taken in inactivated concentration, is able to increase the action of another synergistic hormone, if a frog heart muscle strip or its heart in toto is exposed to a sequential action of both these hormones, 2) how hormone mixtures and different extracts from endocrine glands affect a frog heart muscle strip.