COMMERCIAL FERTILIZERS. 



361 



Valuation per two thousand pounds : — 



231.6 pounds of soluble phosphoric acid, 

 37.4 pounds of reverted phosphoric acid, 

 3.2 pounds of insoluble phosphoric acid, 

 46.4 pounds of potassium oxide, . 

 49 2 pounds of nitrogen. 



18 53 



2 81 



10 



1 97 



8 36 



$31 77 

 Darling's Ground Bone. 



(Collected of C. N. Pearsey, Danvers, Mass.) 



Guaranteed composition : Total phosphoric acid, 22 to 25 

 per cent. ; bone phosphate, 52 to 55 per cent. ; nitrogen, 

 3.5 to 4.5 per cent, (equivalent to ammonia, 4 to 5 per 

 cent.). 



Moisture at 100° C, . 

 Total phosphoric acid, . 

 Soluble phosphoric acid. 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid. 

 Nitrogen, 

 Insoluble matter, . 



Valuation per two thousand pounds : 



9.6 pounds of soluble phosphoric acid, 

 170.6 pounds of reverted phosphoric acid, 

 312.8 pounds of insoluble phosphoric acid, 

 64.6 pounds of nitrogen. 



Lee, Blackburn & Co.'s Ground Bones. 

 (Collected of Lee, Blackburn & Co., Lawrence, Mass.) 



No guaranty stated. 



Moisture at 100° C, . 

 Total phosphoric acid, . 

 Soluble phosphoric acid. 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid, . 

 Nitrogen, .... 



Insoluble matter, .... 



Valuation per two thousand pounds : 



82. pounds of reverted phosphoric acid, 

 361.8 pounds of insoluble phosphoric acid, 

 42. pounds of nitrogen. 



Per cent. 



7.42 



24.65 



.48 



8.53 



15.64 



3.23 



.70 



fO 77 



12 80 



15 64 



9 69 



$38 90 



Per cent. 



9.37 

 22.19 

 none. 



4.10 

 18.09 



2.10 



1.96 



$30 54 



