CO^IMERCIAL FERTILIZERS. 



383 



Darling's Ground Bone. 



(Collected at Experiaient Station, Amkerst, Mass.) 



Guaranteed composition: Total phosphoric acid, 22 to 25 

 per cent. ; bone phosphate, 52 to 55 per cent. ; ammonia, 4 

 to 5 per cent, (equivalent to nitrogen, 3.5 to 4.5 per cent.). 



Per cent. 



Moisture at 100° C. . . . . . 4.12 



Total phosphoric acid, 24 78 



Soluble phosphoric acid, .32 



Reverted phosphoric acid, 7.81 



Insoluble phosphoric acid, 16.65 



Nitrogen, 



Insoluble matter, 



Valuation per two thousand pounds : — 



6.4 pounds of soluble phosphoric acid, 

 156.2 pounds of reverted phosphoric acid, 

 333. pounds of insoluble phosphoric acid, . 

 67.4 pounds of nitrogen, 



$38 99 



H. Preston & Son's Ammoniated Superphosphate. 



(Collected of C. A. Dewy, Pittsfield, Mass.) 



Guaranteed composition : Reverted phosphoric acid, 9 to 



11 per cent. ; potassium oxide, 2 to 3 per cent. ; ammonia, 



3 to 4 per cent, (equivalent to nitrogen, 2.5 to 3.3 per 



cent.). 



JVIoisture at 100° C, 

 Total phosphoric acid, . 

 Soluble phosphoric acid. 

 Reverted phosphoric acid. 

 Insoluble phosphoric acid, 

 Potassium oxide, . 

 Nitrogen, 

 Insoluble matter, . 



Per cent. 



15.09 

 12.24 

 7.07 

 2.19 

 2.98 

 .16 

 3.07 

 3.14 



Valuation per two thousand pounds : 



141.4 pounds of soluble phosphoi'ic acid, 

 43 8 pounds of reverted phosplioric acid, 

 69.6 pounds of insoluble phosphoric acid, 



3.2 pounds of potassium oxide, . 

 61.4 pounds of nitrogen. 



$11 31 



3 29 



1 79 



14 



10 44 



$26 97 



