COMMERCIAL FERTILIZERS. 



385 



Boifkei''s Dissolved Bonehlack. 

 (Collected of Pease & Easter brook, Fall River, Mass.) 



Guaranteed composition : Soluble phosphoric acid, 15 to 

 18 per cent. 



Moisture at im° C, 

 Total phosphoric acid, . 

 Sohible phosjihoric acid, 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid, 

 Insoluble matter, . 



Valuation per two thousand pounds : 



282.6 pounds of soluble phosphoric acid, 

 22.8 pounds of reverted phosphoric acid, 

 9. pounds of insoluble phosphoric acid, 



Per cent. 



15.90 



15.72 



14.13 



1.14 



.45 



2.78 



$22 01 

 1 71 



27 



$24 59 



Pratfs Magnesia Fertilizing Compound. 

 (Eureka Fertilizer Company, Boston; collected of John J. Pratt, Wakefield, Mass.) 



Guaranteed composition : Total phosphoric acid, 2 per 

 cent. ; potassium oxide, 2 per cent. ; nitrogen, 2 per cent. ; 

 calciiun oxide, 12 per cent. ; magnesium oxide, 17 per cent. ; 

 sulphuric acid, 17 per cent. 



Vex cent. 



1.63 



Moisture at lOu^ C , 

 Total phosphoric acid. 

 Potassium oxide, . 

 Xiti'Ogen, 

 Calcium oxide, 

 Magnesium oxide, . 

 Sulphuric acid, 

 Carbonic acid. 

 Insoluble matter, . 



Valuation per two thousand pounds : — 



38.4 pounds of phosphoric acid, . 

 24. pounds of potassium oxide, . 

 35.4 pounds of nitrogen, .... 

 340. pounds of magnesium oxide, 



1.92 



1.20 



1.77 



11.45 



16 90 



14.08 



3.00 



30.23 



$2 30 

 1 00 

 6 02 



16 00 



$25 32 

 Sea Fowl. [HD] 

 (Bradley Fertilizer Company, Boston; collected of D. ,1. Wright, Northampton, 



Mass.) 



Guaranteed composition : Total phosphoric acid, 11 to 14 

 per cent. ; soluble phosphoric acid, 7 to 8 per cent. ; re- 



