340 



BOARD OF AGRICULTURE. 



Williams, Clark & Co.'s ^^Americus" Ammoniafed Superphos- 

 phate. 

 (Collected of John Sullivan, Northampton, Mass.) 



Guaranteed composition : Total phosphoric acid, 11 to 13 

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

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

 ric acid, 1 to 3 per cent. ; potassium sulphate, 2 to 3 per 

 cent. ; ammonia, 3 to 4 per cent, (equivalent to nitrogen, 

 2.5 to 3.3 per cent.) ; magnesium sulphate, 3 to 4 per cent. 



Moisture at 100° C, 

 Total phosi?horic acid, . 

 Soluble phosphoric acid. 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid, 

 Potassium oxide, . 

 Nitrogen, 

 Insoluble matter, . 



Valuation per two thoweand pounds : — 



207.2 pounds of soluble phosphoric acid, 

 48.8 pounds of reverted phosphoric acid, 

 21. pounds of insoluble phosphoric acid, 

 51.6 pounds of potassium oxide, . 

 65.0 pounds of niti-ogen. 



Per cent. 



9.50 

 13.85 

 10.36 

 2.44 

 1.05 

 2.58 

 3.28 

 1.53 



$16 58 



3 66 



63 



2 84 



11 15 



$34 86 



Bradley's " Original Coe" Superphosphate of Lime. 

 (Collected of D. J. Wright, Northampton, Mass.) 



Guaranteed composition: Total phosphoric acid, 11 to 14 

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

 verted phosphoric acid, 2 to 3 per cent. ; available phos- 

 phoric acid, 9 to 11 per cent. ; insoluble phosphoric acid, 2 

 to 3 per cent. ; nitrogen, 2.05 to 2.85 per cent, (equivalent 

 to ammonia, 2.5 to 3.5 per cent.). 



Moisture at 100° C, 

 Total phosphoric acid, . 

 Soluble phosphoric acid. 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid, 

 Nitrogen, 

 Insoluble matter, . 



Per cent. 



13.50 

 13.84 

 8.00 

 3.33 

 2.51 

 3.47 

 5.68 



