Abstract
Uniformly prepared pellets of various crystalline compounds, subcut. implanted in 99 adult rats, required the following periods for 90% absorption: hexes-trol, 54 days; diethylstilbestrol dipropionate, 140 days; di-ethylstilbestrol methyl ether, 145 days; diethylstilbestrol methyl ether acetate, 220 days; testosterone dipropionate, 272 days. Anhydrohydroxyprogesterone pellets were less than 30% absorbed in 300 days. The results of earlier expts. arc tabulated for comparison.