A distinct retention of calcium, magnesium, and phosphorus was noted, which was not accompanied by corresponding changes in general metabolism, as evidenced by a practical balance of nitrogen and sulphur.

It is concluded that there is a primary disturbance in the metabolism of the mineral elements mentioned, with the probable formation of new bony tissue.

The distribution of elements between urine and feces shows no abnormal variations.

A suggestion is made as to the reasons for variable calcium output in the urine on a uniform diet.

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