METABOLISM 



147 



This conclusion is questioned by Hunter, Givens and Guion 

 ('14) who worked with wild Norways having bod}^ weights of 

 about 100 grams or less. Their data are given in table 104. 



TABLE 103 

 Male rat weighing 197 grams. Average of 6 days 



They conclude that owing to the simultaneous high output 

 of allantoin the urine of rats contains the same products of purine 

 metabolism as that of other rodents, and contains them in the 

 same proportions. 



TABLE lot 

 Protein metabolism in normal young rats 



The high output of uric acid is accordingly merely an expres- 

 sion of the fact that the whole purine metabolism, like the pro- 

 tein metabolism or energ}^ exchange, of so small an animal is 

 pitched at a far higher level than that of man. 



Observations on the excretion of total nitrogen and uric acid in 

 normal albinos fed during the experimental period on a thin 



