MANURE. 



197 



are, it will be remembered, at the head of the class of 

 manures composed of salts. First, the liquid evacuation of 

 cattle, what is its agricultural value as a manure 1 Its com- 

 position will form the answer. 



Cow's urine was long ago examined by Rouelle and by 

 Brandt, whose results have formed the basis of all calcula- 

 tions of its value for almost half a century. The results are 

 evidently defective. The more exact analysis of cattle 

 urine, by Sprengel, who has devoted particular care to the 

 subject, gives, as the average of many trials, the following, in 

 1000 pounds : 



Water, 926.24 



Urea, 40.00 



Albumen, . .10 



Mucus or slime, 1.90 



Hippuric acid, 

 Lactic acid, |- 



Carbonic acid, J 



Combined with potash, 

 soda and ammonia, (orra- 

 mg salts, 



.90 

 5.16 

 2.56 



Ammonia, i " 2.05 



Potash, 

 Soda, . 

 Sulphuric acid. 

 Phosphoric acid. 

 Chlorine, 

 Lime, . 

 Magnesia, 

 Alumina, , 

 Oxide of iron, 

 Oxide of manganese, 

 Silica, . 



Combined with soda, 

 • lime and magnesia, form- 

 ing saltk, 



6.64 



5.54 



4.05 



.70 



2.72 



.65 



.36 



.02 



.04 



.01 



.36 



1000.00 

 Let this now be compared with the standard of value, 



