Abstract
It was previously reported that were significant differences in the alkaline phosphatase activity of several organs between the cure of rickets in the administration of vitamin D and so-called spontaneous cure which had been frequently observed in experimental rickets of rats. "Phosphate cure" considered as the most important one among causes of spontaneous cure is studied with x-ray photograph and with the analysis of bone salts on comparison with "vitamin D cure". There are appreciable differences in x-ray pictures between two curative processes. In phosphate cure, phosphate precipitates on the bone matrix at first, and then the precipitation of calcium increases gradually, and the ash content is more abundant than in another case. On the other hand, the process of the precipitation of bone salts in vitamin D cure is reverse.
