MANURE. 175 



The samples examined by Ure were from the purest 

 guano, furnished by the governments of Peruvia and Bolivia. 



Of the 32.3 parts of organic matter, &;c., examined by 

 Voelkel, about 12 parts are soluble in w4ter. 



An analysis of one sample indicates little of the general 

 character of the deposit. Its Value depends chiefly on its 

 volatile constituents. Two samples from the sanae parcel, 

 yielded Professor Johnston : 



No. 1. 

 Water, salts of ammonia, and organic matter, . . 23.5 

 Sulphate of soda, . . . . . . .1.8 



Common salt and phosphate of soda, . . . 30.3 

 Phosphates of lime and magnesia, and carbonate of 



lime, 44.4 



100.0 



No.% 

 Water and volatile matter, ..... 51.5 

 Ammonia, ........ 7. 



Uric acid, 8 



Common salt and sulphate and phosphate of soda, . 11.4 

 Phosphate of lime, 29.3 



100.0 



The average of several hundred analyses of guano from 

 South America and Africa, afforded Professor Johnston, per 

 100 parts : 



Water, from . . . t . 12.9 to 29.6 

 Organic matter and salts of ammonia, . 28.9 to 35.9 

 Phosphates, 26.8 to 38.6 



Ammonia is the most valuable ingredient ; next, a peculiar 



