Effects of Pantothenic Acid (Calcium Pantothenate) and of Thyroxine on the Development of Chicken Embryos

IN earlier investigations, we have demonstrated1 that the injection of 100 µgm. of calcium pantothenate into the yolk sac of chicken eggs after incubation periods of 4 and 10 days is responsible for an increase in body-weight, lasting 3–6 days. Together with the increase in body-weight, we have observed also an increase in tissue differentiation (studied by means of serial histological examination) especially of the nervous system (ganglia), kidneys, glandular stomach, liver and cartilages.