Digestion, Respiration and Caiorimetry. 39 



The Calories of food substances show how much heat these will 

 impart when utilized, for that purpose by the animal, or the the- 

 oretical amount of work they can accomplish. 



Eeduced to available form, the Calories in feeding stuffe may 

 be stated as follows: 



In one gram. In one pound. 



Digestible protein 4.1 Calories. 1860 Calories. 



Digestible carbohydrates. 4.1 Calories. 1860 Calories. 



Digestible fat 9.3 Calories. 4220 Calories. 



Knowing the digestible constitaenta of any feeding stuff, the 

 student can readily determine its potential energy by using the 

 above factors. 



