Abstract
In immature rats, prolonged adm. of the hormone caused decreased wt. of pituitary, adrenals, ovary, uterine horns, and inhibition of estrus with mucification of vaginal epithelium. The degree of uterine atrophy was not in proportion to the ovarian atrophy. The adult rat reacted similarly, except that the pituitary showed no significant wt. decrease. The deleterious effect of prolonged testosterone treatment on the ovaries was temporary. Restitution of structure and function occurred within 29 days.