COMMERCIAL FERTILIZERS. 



339 



Bridges' Fish and Potash. 

 (Collected of B. F. Bridges, So. Deerficld, Mass.) 



Guaranteed composition : Total phosphoric acid, 3 to 4 

 per cent. ; potassium oxide, 3 to 4 per cent. ; nitrogen, 2| 

 to 4 per cent. 



Per cent. 



26.18 

 3.69 



Moisture at 101° C, 

 Total phosphoric ajid, . 

 Soluble iihosphoric acid, 

 Reverted jihosphoric acid, 

 Insoluble 2)liosplioric acid. 

 Potassium oxide, . 

 Nitrogen, 

 Insoluble matter, . 



Valuation per two thousand pounds : — 



19 2 jjounds of soluble phosphoric acid, 

 41. pounds of reverted phosphoric acid, 

 13.6 pounds of insoluble phosphoric acid, 

 73 8 pounds of potassium oxide, . 

 81.4 pounds of nitrogen, 



Standa rd Superphosphate. 



.96 

 2.05 



.68 

 3.69 

 4.07 

 2.20 



$1 54 



3 08 



41 



3 14 



13 84 



$22 01 



(Standard Fertilizer Company, Boston; collected of Joseph Breck & Sons, Boston, 



Mass.) 



Guaranteed composition : Available phosphoric acid, 9 to 

 13 per cent. ; insoluble phosphoric acid, 2 to 3 per cent. ; 

 potassium oxide, 2 to 4 per cent. ; nitrogen, 2.5 to 3.3 per 

 cent, (equivalent to ammonia, 3 to 4 per cent.). 



Moisture at 100° C, 

 Total phosphoric acid, . 

 Soluble phosphoric acid, 

 Reverted phosphoric acid. 

 Insoluble jihosphoric acid. 

 Potassium oxide, . 

 Nitrogen, 

 Insoluble matter, . 



Valuation per two thousand pounds : — 



157.4 pounds of soluble phosphoric acid, 

 48.4 pounds of reverted phosphoric acid, 

 39.2 pounds of insoluble phosphoric acid, 

 38.6 pounds of potassium oxide, . 

 67.4 pounds of nitrogen. 



Per cent. 



12.65 

 12.25 

 7.87 

 2.42 

 1.96 

 193 

 3.37 

 4.15 



$12 59 



3 63 



1 18 



1 74 



11 46 



$30 60 



