“…Case 1 had suffered from severe tetany for at least one year preceding the use of calciferol and had failed to respond to parathormone, low phosphorus-high calcium diet, two parathyroid gland transplants, moderate doses of viosterol, and calcium salts in amounts suggested by Boothby and Davis (23 Daily doses of 225,000 to 300,000 vitamin D units resulted in a progressive rise in the serum calcium in both patients, when the calcium intake was adequate. Doses of 150,000 units daily resulted in a rise in Case 2 (Period III), but merely maintained the serum calcium at its initial level in Case 1 (Period IX).…”