METABOLISM 



145 



4. The total amount of nitrogen eliminated by the rat during twenty- 

 four hours at different weights may be determined with a high degree of 

 accuracy by the formula (40) . 



For the nitrogen exchange in normal albino rats, the average 

 values for three 3 day periods are given according to increasing 

 body weight in table 100 (Cramer and Pringle, '10). 



TABLE 99 



Showing the average amount of urine, feces, and nitrogen per day. Male rats alone 

 were used. Average values for body weight groups 



These observations show that the nitrogen in the urine in- 

 creases with the increase in body weight, while that in the feces 

 and that retained, dimmish. 



The distribution of nitrogen in the urine has been studied by 

 Ordway and Morris ('13) in young rats two males and one fe- 

 male and their results are given in table 101. 



Folin and Morris ('13) have made similar studies in older rats 

 and their determinations are given in tables 193 and 150. 



