Three cases of rather severe sprue are described, giving details of blood calcium studies, with graphs of these, and comparison of the calcium lactate and parathyroid therapy, diets, and blood picture. As case 2 was the only one with long continued parathyroid treatment it is believed that this may have been partially responsible for a later developing decreased blood calcium and tetany.
It would seem that the dry extract of parathyroid is not as impotent as has been maintained by some and that it may be even a dangerous therapeutic measure if carried out over a long period. The question is, of course, not settled. The cases are described so that others who may have had such may help throw any further light on the problems of one of our internal secreting extracts, and of the disease tropical sprue.