36 



METABOLISM OF ORGANIC AND INORGANIC PHOSPHORUS. 



TABLE I. Nitrogen and phosphorus metabolism Preliminary period Continued. 



No. 4. RABBIT FED INORGANIC PHOSPHORUS. 



o 1.72 grams of inorganic phosphorus per period were intimately mixed with the food. 

 NITROGEN BALANCES. 



The rabbit which gained in weight, No. 3, received a larger amount 

 of nitrogen than the others. In fact, the amount of nitrogen ingested 

 in all cases varied somewhat, but the total during a period of seven 

 days was from 5 to 6.6 grams of nitrogen per 1,000 grams of body 

 weight, No. 3 receiving the largest relative amount. The average 

 figures show that relatively more nitrogen was excreted in the urine 

 in the cases of rabbits No. 1 and No. 2 (those fed organic phosphorus), 

 than in the cases of No. 3 and No. 4 (fed inorganic phosphorus). 

 The amount of nitrogen eliminated in the feces varied with the indi- 

 vidual rabbit. No. 1 eliminated 10.6 per cent and No. 2, 14.6 per 

 cent. No. 3 eliminated 13.8 per cent and No. 4 only 9.3 per cent in 

 this manner. Nos. 1 and 2 retained a smaller proportion of the 

 metabolized nitrogen than did Nos. 3 and 4, the figures being respec- 

 tively 22, 24, 29, and 26 per cent. This means that the rabbits fed 

 inorganic phosphorus retained a larger proportion of the absorbed 

 nitrogen than did those fed organic phosphorus; and it appears that 

 those fed organic phosphorus excreted in the urine a larger propor- 

 tion of the ingested nitrogen, but did not utilize this nitrogen so well 

 as did the rabbits fed inorganic phosphorus, 



