1887.] 



PUBLIC DOCUMENT — No. 33. 



113 



Fish and Potash. 



[Sent on for examination from Medfield, Mass.] 



Moisture at 100° C 



Total phosphoric acid, 



Soluble phosphoric acid (8 cents per pound) , 

 Reverted phosphoric acid (7| cents per pound), 

 Insoluble phosphoric acid (3 cents per pound), 

 Potassium oxide (41 cents per pound), . 

 Nitrogen (17 cents per pound). 

 Insoluble matter, 



Valuation per 2,000 lbs., 



High Grade Superphosphate. 



[Sent on from Boston, Mass.] 



Moisture at 100° C, . 

 Total phosphoric acid. 

 Reverted phosphoric acid. 

 Soluble phosphoric acid, . 

 Insoluble phosphoric acid. 

 Sulphuric acid, . 

 Calcium oxide, . 

 Oxides of alumina and iron, 

 Magnesium oxide. 

 Insoluble matter, 



Per cent, 



23.58 

 6.26 

 3.58 

 l'.33 

 1.35 

 3.24 

 3.07 

 1.90 



$21 73 



Per cent, 

 5.03 



25.36 



15.23 

 0.25 

 9.88 

 0.22 

 0.70 



24.95 

 0.10 



18.91 



Valuation per ton of 2,000 lbs.. 



$29 18 



German High Grade Superphosphate. 



[I. Sent on from New York City, N. Y., by a Boston manufacturer of fertilizers. 

 II. Sent on from Boston, Mass.] 



