80 



EXCREMENTS AND URINE. 



Of 100 lbs. of mineral substances in the food 



of a sheep, ... — 114 lbs. 



« hog, .... 5 95 " 



« horse, ... 2 98 « 



" milch cow, . . — 94 " 



(6 lbs. in the milk). 



As these figures show, the three substances first 

 named are principally consumed in breathing and 

 perspiration, whilst the nitrogen is wasted by these 

 processes in a far more trifling proportion. The 



