Abstract
The admn. of liver completely counteracted the retardation of growth and inhibition of ovarian development observed in immature rats fed toxic amts.of thyroid. Wheat germ, yeast, or increased amts. of salt mixture, casein, thiamine, riboflavin, pyridoxine, Ca pantothenate, nicotinic acid, inositol, [image]-aminobenzoic acid, biotin or folic acid were ineffective in this regard. The suggestion is made that liver contains some factor other than the above required for normal growth and ovarian development in the immature thyroid-fed rat.