COMMERCIAL FERTILIZERS. 



347 



Mitchell's Standard Superpliosphate. 

 (Collected of J. & J. A. Rice, Worcester, Mass.) 



Guaranteed composition: Total phospiioric acid, ILo to 

 12.5 percent. ; soluble phosphoric acid, 7.5 to 8.5 percent. ; 

 reverted phosphoric acid, 1 to 2 per cent. ; potassium oxide, 

 3 to 4 per cent. ; ammonia, 2.5 to 3.5 per cent, (equivalent 

 to nitrogen, 2 to 2.9 per cent.). 



Moisture at 100° C, 

 Total phosphoric acid, . 

 Soluble phosphoric acid. 

 Reverted jihosphoric acid, 

 Insoluble phosphoric acid, 

 Potassium oxide, . 

 Niti'ogen, 

 Insoluble matter, . 



Valuation per two thousand pounds : 



163.2 i^ounds of soluble phosphoric acid, 

 59.4 pounds of reverted phosphoric acid, 

 45.6 poimds of insoluble phosphoric acid, 

 40.6 poimds of jjotassium oxide, . 

 40. pounds of nitrogen, 



Tcr ccut. 



20 48 

 13.41 

 816 

 2.97 

 2.28 

 2.03 

 2.00 

 7.42 



$13 06 

 4 46 

 1 37 

 1 73 

 6 80 



$27 42 

 E. Frank Coes Geyiidne Ammoniated Bone SuperjyJiosphate. 



(Collected of J. S. Clark & Son, Worcester, Mass.) 

 Guaranteed composition : Soluble phosphoric acid, 7 to 10 

 percent.; reverted and insoluble phosphoric acid, 1.5 to 3 

 per cent. ; nitrogen, 2 to 3 per cent, (equivalent to ammo- 

 nia, 2.25 to 3.5 per cent.). 



Moisture at 100° C, 

 Total phosphoric acid, . 

 Soluble phosphoric acid, 

 Reverted phosphoric acid. 

 Insoluble phosjihoric acid, 

 Nitrogen, 

 Insoluble matter, . 



Valuation per two thousand pounds 



157.4 iiounds of soluble phosphoric acid, 

 38.6 i^ounds of reverted j)hosphoric acid, 

 24.2 pounds of insoluble phosphoric acid, 

 62.4 poimds of nitrogen, 



$26 83 



