In the preceding papers of this series we have reported the results of our studies on the energy, fat and protein metabolism and the excretion of creatine and creatinine of adolescent girls. In the present paper we are concerned with the metabolism of calcium, phosphorus, sodium and magnesium in the same twenty-three girls (twenty-two in the case of magnesium and sodium).
METHOD OF EXPERIMENT
The technic of feeding, of collection of specimens and of preparing them for chemical analysis has been described. For mineral analysis all specimens were first wet-ashed according to the procedure described by Wang,2 and aliquots of the digested mixture were used for the various determinations. Duplicate digestions were made on each of the three day composite specimens of urine and on the dried and pulverized foods and feces. Calcium was determined also by the method described by Wang.2 The procedure of Fiske and Subbarrow
WANG CC, KAUCHER M, WING M. METABOLISM OF ADOLESCENT GIRLSIV. MINERAL METABOLISM. Am J Dis Child. 1936;52(1):41–53. doi:10.1001/archpedi.1936.04140010050004
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