Abstract 1. 1. Further surgical prevention of parathyroid tetany seems to depend upon the development of the technique of reimplantation of parathyroid tissue at time of operation, especially in patients operated two or more times. 2. 2. Calcium by mouth is of little value in the absence of adequate parathyroid tissue. It is impractical to give it intravenously in chronic tetany. 3. 3. The feeding of dessicated parathyroid gland seems useless. 4. 4. The subcutaneous administration of the parathyroid hormone in dosages as usually given has little, if any, influence on the blood calcium level. Apparently it should be given in much larger dosages. 5. 5. The clinical symptoms seem to be as good a guide to the amount given as the blood calcium level.