Pea seeds contain less calcium than phosphorus, potassium or magnesium; more than half of this calcium is located in the testa. Peas at either end of a pod have more calcium than those in the middle. When pea seeds are allowed to germinate in water, less than 30 per cent of the cotyledonary calcium moved to the growing axis during the first 15 days of germination, whereas 70–90 per cent of magnesium, potassium and phosphate was exported. Various attempts to increase the amount of calcium exported were not successful. When radioactive calcium was applied to the cotyledons, essentially no movement to the axis was observed under conditions where extensive movement of radioactive phosphate occurred.