Abstract
The conc. of K in the skeletal muscle was appreciably decreased in rats injected with progesterone over a period of 2 wks., with estradiol dipropionate from 2-4" wks. and with testosterone propionate and estradiol benzoate over a period of 6 mos. The similarity of the change in the skeletal muscle K in the present expts. to that found in animals injected with desoxycorticosterone acetate is discussed.