KYNURENIC ACID. 231 



a commercial preparation containing dried meat, carbohydrates 

 (sugar-beet), etc.; the albumin was commercial albumen e 

 sanguine ; the vegetable proteid was crystallized edestin (phy- 

 tovitellin) prepared from hemp seed after the manner already 

 described by one of us ; * the Witte's " pepton " was the 

 widely used product made up almost entirely of proteoses 

 (from fibrin). The latter preparation contained 14 per cent 

 N. A mixture of inorganic salts as recommended by J. 

 Munk f was daily added to the diet in experiment C. 



Various investigators have demonstrated that the proteoses 

 and peptones may show caloric and nutritive values equiva- 

 lent to those of the proteids from which they originate.^: 

 Several of our experiments (B, C, D) show a characteristic 

 excretion of kynurenic acid after repeated feeding of proteo' 

 (Witte's "pepton"). No disturbances of the gastro-int 

 nal tract (as with " Somatose," p. 235) were observed with tk - 

 product. 



* Chittenden and Mendel, Journal of Physiology, 1894, xvii, p. 49. 

 t J. Munk, Virchow's Arch. f. d. exper. Pathologic, cxxxii, p. 102. 

 | Cf. Munk and Ewald, Die Ernahrung, 1895, p. 34. 



