60 



PHYSIOLOGY 



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 (33). 



The normal protein metabolism of the rat has been studied 

 by Folin and Morris ('13). They find a distribution of nitro- 

 gen in the urine as shown in tables 43, 44. 



TABLE 43 

 Female rat weighing 290 grams. Average of 5 days 



TABLE 44 

 Male rat weighing 197 grams. Average of 6 days 



"It will be seen from examination of the average results that 

 the percentage composition of rat urine differs but little from 

 that of human urine." 



a) Body temperature. Using the mercurial thermometer in the 

 rectum, Pembrey ('95) reports a body temperature of 37.5C. 

 in adult Albinos. Macleod ('07) by the same method finds a 

 range of 37.5-38.5C. with a mean of 37.9C.; Congdon ('12) 

 also by the same method a temperature of 37.9C. in the young; 

 in the adult, when reared at 16C., a temperature of 36.2C. 

 and when reared at 33C., of 37.2C. Graham and Hutchison 



