URINE. 



301 



December 5 to 18, when the squad was essentially on maintenance 

 diet at the lower level. (See tables 41 and 43.) The nitrogen in the 

 food for the first 10 days in the experiment and for December 5 to 

 18 are also given in tables 40 and 42. Considering the nitrogen 

 in the urine during the first 12 days of the experiment (table 41), we 

 find that fluctuations occur not only between different men, but that 

 the same man shows differences from day to day. The lowest nitrogen 

 output is almost invariably shown by Tom. The total nitrogen output 

 per day for the 12 men averages not far from 145 to 150 grams for 

 this period. 



Table 40. — Total nitrogen in food during first 10 days of experiment — Squad A. 



^ Samples were not obtained of the diet on September 28 and 29. 

 Table 41. — Total nitrogen in urine per 24 hours during first 12 days of experiment — Squad A. 



