EXCREMENTS AND URINE. 



87 



their constituent elements, and no less their value as 

 manure, must depend upon the nature, quantity, and 

 excellence of the fodder, and must also vary with 

 every alteration of the latter. Next to this, how- 

 ever, the species, the age, the tending, and service 

 performed by animals, are each of great influence 

 upon the quantity and quality of manure, so that 

 different results are exhibited even by the employ- 

 ment of the same means of fodder. Under these 

 circumstances, the isolated chemical analyses of ani- 

 mal excrements hitherto made known can lay claim 

 only in an approximative manner to general accep- 

 tation. The following figures must accordingly be 

 regarded only as approximate^ although in individual 

 cases they were ascertained with great exactitude. 



1,000 lbs, of Fresh Excrements contained : — 



