BAT AND PERUVIAN GUANO. 



321 



Potassium oxide 

 Sand, &c. 



Per cent. 



Trace. 

 11.40 



Valuation per ton of two thousand pounds : — 



103.4 pounds of phosphoric acid 

 165.2 pounds of nitrogen 



$5 17 

 29 73 



$34 73 



The composition of the bat-guanos, as may be noticed 

 from the statements in previous reports, varies in an unusual 

 degree. They are sold by analysis, and are mainly used 

 with us as a nitrogenous material in the manufacture of 

 fertilizers. A firm in New York advertises the following 

 articles : — 



(a) Bat-guano containing 8 per cent of nitrogen, and 7 

 per cent of phosphoric acid. 



(5) Bat-guano containing 2.39 per cent of nitrogen, and 

 16 per cent of phosphoric acid. 



(<?) Bat-guano containing 5.49 per cent of nitrogen, and 

 9 per cent of phosphoric acid. 



The latter samples evidently consist largely of the bones 

 of bats. 



PeruviamGuano, warranted No. 1. 



$64 13 



