420 



NUTRITION. 



and a cow. From these experiments of Boussingault, Valentin 

 has drawn up the following table in which the total sum of the 

 water, of the ash, and the individual elements of organic matter 

 taken up with the food, is placed in juxta-position with the mean 

 numbers of the daily quantities of water, ash, and organic elements 

 again eliminated through the urine, faeces, and perspiration. 



Hence the elements of the 100 parts of the food consumed by 

 the horse are distributed in the following proportions in the 

 excretions : 



An experiment which was continued for three whole days upon 

 a milch cow yielded the following numbers : 



