EFFECTS OF TRIIODOTHYRONINE ON TADPOLES1

Abstract

DL triiodothyronine (2.5 or 10 [mu]g. per 500 cc.) and D-L thyroxine (10 [mu]g. or 40 [mu]g. per 500 cc.) were effective in shortening Rana clamitans body-length when the tadpoles were immersed in these compounds for 10 days. An estimation of relative potency indicated that triiodothyronine was approx. 3.8 times more effective than thyroxine.