44 METABOLISM OF ORGANIC AND INORGANIC PHOSPHORUS. 



by the different methods are practically the same whether organic or 

 inorganic phosphorus is fed. 



TABLE VI. Various forms of phosphorus in urine Principal period. 



An ether-alcohol extraction of an inorganic phosphate solution 

 (100 cc of a r_iicrocosmic salt solution) was made containing 0.2 gram 

 of phosphoric acid and this gave 0.0054 gram of phosphoric acid by 

 the ether-alcohol extraction method, as large an amount of ether- 

 alcohol soluble phosphorus as was obtained in the average samples 

 of the urine examined. This fact points to the conclusion that no 

 ether-alcohol soluble phosphorus is normally present in the urine of 

 rabbits, even after the feeding of organic phosphorus for several 

 months. 



A review of this question of the presence of organic phosphorus in 

 the urine in general supports this conclusion. Ronald a was the 

 first to call attention to the presence of organic phosphorus in the 

 urine, and Rockwood b claims to have found phosphocarnic acid 

 present. Bergmann, c however, using glycero-phosphoric acid made 

 subcutaneous injections on sheep, but could not detect the same in the 

 urine. Patten, Jordan, and Hart d in their extensive experiments 

 with cows found no organic phosphorus eliminated in the urine, and 

 like results were obtained by Mendel and Underbill e and by Le Clerc 

 and Cook / working with rabbits and a dog. 



Philosophical Transactions, 1864, p. 461. 

 b Abs., Chem. Centrbl., 1895 (1), p. 1063. 

 c Arch, exper. Path. Pharm., 1902, 47 :77. 



d Amer. J. Physiol., 1906, 16 :268. 



e Ibid., 1906, .77:75. 



/ J. Biol. Chem., 1906, 2 :203. 



