98 



EXCREMENTS AND URINE. 



If, therefore, from green aliment more faeces are pro- 

 cured, they can never, from the great proportion of 

 water they contain, be so rich in manuring substan- 

 ces as those generated from dry, nutritive matter. 



5. Age of the Anwials, Young animals require 

 both organic and inorganic substances for their 

 growth ; these they take from the fodder, and hence 

 a less proportion of these substances is discharged 

 from their bodies. The manure of a young beast 

 will accordingly, even with the same foddering, be 

 always weaker than that of full-grown animals. 

 In the urine of a calf reared upon milk, chemical 

 analysis found in 1,000 lbs. only 1 lb. of solid sub- 

 stances with a mere trace of nitrogen, whilst in the 

 same quantity of this secretion from a cow 80 lbs. of 

 solid constituents and 8 lbs. of nitrogen were discov- 

 ered. In like manner, in 1,000 lbs. of urine from a 

 child of eight months, 3 lbs. of nitrogen were found ; 

 from a child of eight years, 7 lbs.; and from a full- 

 grown man, 18 lbs. 



6. Employment of Animals. The more labor and 

 exertion an animal is compelled to undergo, the 

 more it respires and sweats ; the greater the quantity 

 of nutritive constituents, however, which is removed 

 from the body by the lungs and skin, the less of 

 these can pass into the excrements and urine. A 

 working beast will accordingly furnish, from the 

 same amount of food, manure in smaller quantity 

 and of less value than one at rest. Where rest and 

 abundant provender are conjoined (as in the case of 



