36 Feeds and Feeding. 



This sliows that 2.3 pounds or only 1.3 per cent, of what entered 

 the body was retained as a permanent portion thereof, the remain- 

 der passing away as waste. Part of the substance was inert mat- 

 ter, and useless, while the larger part was used as fuel for furnishing 

 energy to the body, and passed off as waste after being so used. 



Directing our attention to the portion incorporated in the body, 

 we learn that 35 grams of nitrogen were not excreted, but retained 

 as a portion of the body. Sixteen per cent, of albuminoid sub- 

 stances is nitrogen. The albuminoid tissues representing this 

 quantity of nitrogen are determined in the following manner: 



Albuminoids 

 Nitrogen. Per cent, or lean meat. 



,035 X W = -22 kilograms. 



The albuminoid tissues contain 53 per cent, carbon. Accord- 

 ingly, the amount of carbon in tissue built during the day is as 

 follows: 

 Lean meat Per cent. Carbon, 



,22 X 1^ = .116 kilograms. 



The lean meat therefore contained .116 kilograms of carbon. 

 There remains ,214 kilograms of carbon, which must have gone 

 to form fat. Seventy-five per cent, of fat is carbon, — hence the 

 following: 



Carbon. Per cent. Body fat, 



.214 -T- ^ = .28 kilograms. 



59. Summary of the trial. — From this we learn that there were 



.28 kilograms of fat stored in the body during the day of the trial. 



Arranging these results, together with the mineral matter and 



water retained in the body, for convenient study, we learn that 



tSie nutrients stored as increase were as follows: 



Pounds. 



, 22 kilograms of albuminoids or lean meat 48 



,28 kilograms of fat 61 



.01 kilograms of mineral matter 02 



.625 kilograms of water 1,17 



Total body increase 2,28 



It was shown that the income to the body exceeded the outga 

 by 2,3 pounds; the table accounts for practically all of this in 



