METABOLISM OF THE CAT. 



ing a diet poor in proteids it has been observed to disappear.* 

 Since these observations were made before the introduction 

 of the newer methods for the complete precipitation of uric 

 acid, it may reasonably be questioned whether they possess 

 more than relative value. 



EXPERIMENT H. 



Two cats were employed in this experiment. The food consisted of lean 

 meat alone ; meat mixed with desiccated thymus ; fresh pancreas. 



The method employed in the present experiments has 

 usually consisted in feeding several cats in the same cage 

 with various foods, collecting the urine and determining the 

 uric acid present by the Ludwig-Salkowski method. In 

 several series the acid separated has been estimated by titra- 

 tion with permanganate solution instead of weighing. No 

 attempt has been made to collect the urine for sharply denned 



* See Huppert, Neubauer und Vogel's Analyse des Harns, lOte Auflage, 

 1898, p. 811. 



t The cats rejected part of the food and refused to eat 



