DOMESTIC ANIMALS. 263 



" The cow was foddered with after-math, hay and potatoes ; 

 the horse with the same hay and oats. The quantities of 

 forage were accurately weighed, and their precise degree of 

 moist nrss and their composition were determined from ave- 

 rage samples. Tin; water drunk was measured, its saline 

 and earthy constituents having been previously ascertained. 

 The excrementitious matters passed were of course collected 

 with the greatest care ; the excrements, the urine, and the 

 milk were weighed, and the constitution of the whole estima- 

 ted from elementary analyses of average specimens of each. 

 The results of the two experiments are given in the table on 

 the next page. 



" The oxygen and hydrogen that are not accounted for in 

 the sum of the products have not disappeared in the precise 

 proportions requisite to form water ; the excess of hydrogen 

 amounts to as many as from 13 to 15 dwts. It is probable that 

 this hydrogen of the food became changed into \vater by com- 

 bining during respiration with the oxygen of the air." 



