COMMERCIAL FERTILIZERS. 



3cSl 



verted phosphoric acid, 3 to 4 per cent. ; insohible phospho- 

 ric acid, 1 to 3 per cent. ; potassinm oxide, 2 to 3 per cent, 

 (equivalent to potassium sulphate, 4 to 6 per cent.) ; nitro- 

 gen, 2.35 to 3.3 per cent, (equivalent to auunonia, 3 to 4 

 per cent.) ; magnesium sulphate, 3 to 4 per cent.). 



l"cr cent. 



Moisture at 100" C, 13.41 



Total phosphoric acid, .... 

 Soluble phosphoric acid, 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid. 



Potassium oxide, 



Niti'ogen, ...... 



Insoluble matter, ..... 



Valuation per two thousand pounds : 



189.4 pounds of soluble phosphoric acid, 

 23.0 pounds of reverted phosphoric acid, 

 9. pounds of insoluble phosphoric acid, 

 56. pounds of potassium oxide, . 

 60.8 pounds of nitrogen, 



$30 61 

 Adams' Ground Bone. 



(Adams & Thomas, Springfield, Mass. ; collected of C. W. SLaw, Springtield, 



Mass.) 



Guaranteed composition : Total phosphoric acid, 18 to 20 

 per cent. ; nitrogen, 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 tliousand pounds : — 



2 pounds of soluble phosphoric acid, .... 

 130 pounds of reverted phosphoi'ic acid, 

 243 pounds of insolul)le phosphoric acid, 

 79 pounds of nitrogen, 



$33 91 

 Bradley's XL Superphosphate of Lime. 

 (Collected of Merritt I. Wheeler, Great Barrington, Mass.) 

 Guaranteed composition: Total phosphoric acid, 11 to 14 

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



