METABOLISM OF THE CAT. 



345 



after administration of doses varying from 100 to 150 milli- 

 grams resembled in many respects those described for the dog 

 by Borissow. No alkntoin was detected; however, the 

 number of our experiments is as yet too small to permit a 

 definite conclusion. 



Composition of Cats' Urine The lack of data regarding the 

 normal composition of cats' urine has induced us to append 

 the results of a few analyses carried out on urine obtained 

 during various conditions of diet. The figures represent daily 

 averages calculated from the total of several days. Several 

 different animals are represented in the series. Total nitrogen 

 was estimated by the Kjeldahl process ; urea nitrogen by the 

 Mb'rner-Sjb'quist method; uric acid according to the Ludwig- 

 Salkowski method ; P 2 O 6 by titration with uranium solution ; 

 SO g gravimetrically. Creatinine was found present in cats' 

 urine and separated as the zinc chloride compound. 



AVEKAGE DAILY EXCRETION FOR THE CAT. 



SUMMARY. 



1. Kynurenic acid is not excreted by the cat even during 

 the increased proteid metabolism produced by phlorhizin 

 administration. 



2. The ingestion of thymus and pancreas tissue causes a 

 marked increase in the uric acid output of the cat, thus corre- 

 sponding with the similar observations on man and the dog. 



3. Allantoin excretion is likewise observed after thymus 

 and pancreas feeding, and after uric acid ingestion. Prelimin- 



