Digestion j Respiration and Color imetry. 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. 



Reduced to available form, the Calories in feeding stuffs 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 constituents of any feeding stuff, the 

 student can readily determine its potential energy by using the 

 above factors. 



