494 



PHYSIOLOGY, 



Ingeata, mean weight in g. per day 



Excreta, mean weight in g. per day 



"If we consider the faeces as pure loss, the body has disposed of 

 (94.4 g. ingested 5.4 g. excreted =) 89.0 g. proteid containing 

 (16.2 2.0 = ) 14.2 g. N, besides (82.5 3.7 = ) 78.8 g. fat, and 

 (289.8 3.2=) 286.6 g. carbohydrates. In the urine 16.2 g. N 

 were given off; but 2.0 g. of the N" have come from the body itself 

 i.e., (6.25 X 2= ) 12.5 g. of the body's proteid has been lost. The 

 total proteid metabolism, therefore, has been (89 g. + 12.5 = ) 101.5 

 g. (or 16.2 X 6.25). 



"The ratio of N to C contained in proteid is 1 : 3.28. In thi . 

 proteid destroyed by this man therefore there were 3.28 X 16.2 = 5?.l 

 g. C. The total quantity of C eliminated in the respiration and ii? the 

 urine was 219.5 g. ; there remain 166.4 g. which must havf been 

 derived from nonnitrogenous food. 



"Of carbohydrates 286.6 g. (289.8 ingested 3.2 excreted) were 

 absorbed from the intestine, and this by calculation was found to have 

 contained 124.7 g. C. Now we shall see later that carbohydrates burn 

 in the body more easily than fat. We therefore deduct first the C 

 belonging to carbohydrate. This leaves 41.7 g. C (166.4 124.7) 

 which must have come from fat i.e., since the f&t used contained 

 about seventy-six per cent C, 54.6 g. fat were burned in the body. 



"We conclude that the body has decomposed a mean quantity of 

 101.5 g. proteid, 54.6 g. fat and 286.6 g. carbohydrate per day. Com- 



