AMMONIATED SUPERPHOSPHATES. 



269 



gary, Italy and Egypt ; the bat guano from the latter country 

 has been found to contain in some cases as high as 37.2 per 

 cent, of nitrogen, whilst some samples from Hungary contained 

 but 1.8 per cent, of nitrogen in the presence of 11.54 per 

 cent, of insoluble phosphoric acid. From what has been 

 stated in this connection it is scarcely necessary to add 

 that none but guaranteed articles ought to be bought by 

 farmers. 



The samples which served for my examination I owe to 

 the kindness of Professor Win. McMurtrie of Washington, 

 D. C. and W. H. Bowker, Esq., of Boston, Mass. Their 

 respective commercial value, allowing 18 cents per pound of 

 nitrogen and five cents for one pound of phosphoric acid, 

 varies from $33 to $38 per ton of 2,000 pounds. 



Ammoniated Superphosphates and Superphosphates. 



I. — Ammoniated Superphosphate of Messrs. 



Boston. 



O. Foote & Co. 



(Collected of Messrs. W. H. Bowker & Co., Boston, Mass.) 



Total phosphoric acid, 11.93 per cent. 



Soluble " " 6.17 



Reduced " " 4.69 



Insoluble " " 1.07 



Nitrogen, 1.48 



Moisture, 33.48 



Valuation per ton of 2,000 pounds. 



123.4 pounds of soluble phosphoric acid, 

 93.8 " of reduced " " 

 21.4 " of insoluble " " . 

 29.6 " of nitrogen, 



$15 42 

 8 45 

 1 28 

 6 22 



$31 37 



II. — Pure Combined Guano of Messrs. Williams & Haven. 



(Collected of Messrs. Bagg & Batchelder, Springfield, Mass.) 



Total phosphoric acid, 

 Soluble " 

 Reduced " " 



Insoluble " " 



Nitrogen, . 

 Potassium oxide, 

 Moisture, . 



