COMPARATIVE VALUE OF FOODS. 



109 



in the animal body. Taking the heat-producing 



capacity of cotton cake, calculated in this manner, as 



100, the values found for other foods will be as 

 follows : 



COMPARATIVE HEAT-PRODUCING- VALUE OF FOODS. 



The correctness of these figures mainly depends upon 

 the digestibility of the respective foods being as shown in 

 the experiments with ruminant animals described in the 

 last section. Linseed cake, from the large proportion of 

 fat and albuminoids which it contains, would be expected 

 to occupy a higher position in the table than maize ; its 

 lower rank is due to its less perfect digestibility. The 

 table on page 97 shows, that while 19 per cent, of the 

 organic matter of linseed cake remain undigested, and 

 therefore useless to the animal, only 11 per cent, of 

 maize are thus wasted. If the linseed cake were 



