380 



BOARD OF AGRICULTURE. 



Reverted phospLovic acid, 

 Insoluble phosphoric acid, 

 Potassium oxide. ..... 



Nitrogen, 



Insoluble matter, ..... 



Valuation per two thouisand pounds : 



179. 2)ounds of soluble phosiihoric acid, 

 25.4 pounds of reverted phosphoric acid, 

 8 8 pounds of insoluble phosphoric acid, 

 47.2 pounds of potassiiun oxide, . 

 56 2 pounds of nitrogen, 



Per cent. 



1.27 

 .44 

 2.36 

 2.81 

 4.38 



$14 32 



1 91 

 26 



2 00 

 9 55 



$28 04 

 Cumbe rlan d Superphosphate . 



(Cumberl.ind Bone Company, Portland, Me.; collected of W. H. Lalley & Co., 



IS'ortb Adams, Mass.) 



Guaranteed composition : Moisture, 14 to 18 per cent. ; 

 total phosphoric acid, 11 to 14 per cent. ; soluble phosphoric 

 acid, 5 to 7 per cent. ; reverted phosphoric acid, 1 to 3 per 

 cent. ; insoluble phosphoric acid, 2 to 4 per cent. ; potas- 

 sium sulphate, 2 to 3 per cent. ; nitrogen, 2 to 3 per cent, 

 (equivalent to ammonia, 2.44 to 3.88 per cent.). 



I'er cent. 



Moisture at 100° C, 18 18 



Total phosphoric acid, .... 



Soluble phosphoric acid. 

 Reverted phosphoric acid, 

 Insoluble iihosphoric acid. 

 Potassium oxide, .... 



Nitrogen, ...... 



Insoluble matter, 



Valuation per two thousand pounds : 



147.8 pounds of soluble jihosphoric acid, 

 67.8 pounds of reverted phosphoric acid, 

 47 6 pounds of insoluble phosphoric acid, 

 37 pounds of potassium oxide, . 

 47.4 pounds of nitrogen, 



$28 44 



'■^AmericAis" Brand Ammoniatpd Bone Superptho^phate. 



(Williams, Clark & Co., New York; collected of J. A. Brewer, Great Barrington, 



Mass.) 



Guaranteed composition : Total phosphoric acid, 11 to 13 

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



