INFLUENCE OF THE VEHICLE UPON THE LENGTH AND STRENGTH OF THE ACTION OF MALE HORMONE SUBSTANCE, TESTOSTERONE PROPIONATE1

Abstract
The test was made on the comb growth of day-old chicks. Crystals gave the strongest and longest stimulation, a single injection of 20 mg. lasting for 71 days. Beef tallow was next best, a 20 mg. dose exerting an action like that of crystals for 17 days and continuing to stimulate growth for 27 days. Palmitic acid was also a satisfactory vehicle. Peanut oil acted in a lesser manner over a total of 17 days. Spermaceti wax and mineral oil gave lesser effects.