528 



BOARD OF AGRICULTURE. 



Moisture at 100° C, 

 Total phosphoric acid, . 

 Soluble phosphoric acid, 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid, 

 Potassium oxide, . 

 Nitrogen, 

 Insoluble matter, . 



Valuation per two thousand pounds : 



129.2 pounds of soluble phosphoric acid, 

 40.4 pounds of reverted lihosphoric acid, 

 22.8 pounds of insoluble phosphoric acid, 



100.8 pounds of potassium oxide, . 

 43.6 pounds of nitrogen. 



$25 96 



Bowker's Hill and Drill Phosphate. 

 (Collected of H. P. Lucas, Pittsfield, Mass.) 



Guaranteed composition : Total phosphoric acid, 11 to 

 14 per cent. ; soluble phosphoric acid, 8 to 9 per cent. ; re- 

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

 phoric acid, 1 to 2 per cent. ; potassium oxide, 2 to 3 per 

 cent, (equivalent to potassium sulphate, 3.7 to 5.5 per 

 cent.) ; nitrogen, 2.5 to 3.25 per cent, (equivalent to am- 

 monia, o to 4 per cent.). 



Per cent. 



Moisture at 100° C, . . • 14.36 



Total phosphoric acid, 10.87 



Soluble phosphoric acid. 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid. 

 Potassium oxide, . 

 Nitrogen, 

 Insoluble matter, . 



Valuation per two thousand pounds : — 



138.8 pounds of soluble phosphoric acid, 

 51.0 jiounds of reverted phosphoric acid, 

 27.6 povmds of insoluble phosphoric acid, 

 30.2 pounds of potassium oxide, . 

 66.8 pounds of nitrogen, 



$20 n 



