322 



BOAED OF AGRICULTURE. 



Valuation per two thousand pounds ; — 



1C7. pounds of soluble phosphoric acid, 

 o7.4 pounds of reverted phosphoric acid, 

 1G.4 pounds of insoluble phosphoric acid, 

 32.G pounds of potassium oxide, 

 53.G pounds of nitrogen, 



Bowker'^s Hill and Drill Phosphate. 

 (Collected of W. H. Earle & Co., "Worcester, Mass.) 



$32 92 



Guaranteed composition : Ammonia, 2 to 3 per cent, 

 (equivalent to nitrogen, 1.6 to 2.5 per cent.) ; total phos- 

 i:)horic acid, 10 to 12 per cent. ; soluble and reverted phos- 

 phoric acid (available), 8 to 10 per cent. ; potassium oxide, 

 2 to 3 per cent., in sulphate of potash. 



[Per cent. 



Moisture at 100° C, 14.06 



11.74 

 6.24 

 2.89 

 3.61 

 2.08 

 3.04 

 3.28 



Total phosphoric acid, 

 Soluble phosphoric acid. 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid. 

 Potassium oxide, 

 Nitrogen, ... 



Insoluble matter. 



Valuation per two thousand pound 



104.8 i^ounds of soluble phosphoric acid, 

 57.8 pounds of reverted phosphoric acid, 

 72.2 pounds of insoluble phosphoric acid, 

 41.6 pounds of potassium oxide, 

 60.8 pounds of nitrogen. 



$32 96 

 Mitchell's Standard Superphosphate, 

 (Collected of J. & J. A. Rice, Worcester, Mass.) 



Guaranteed composition ; Ammonia, 2| to 3^ per cent, 

 (equivalent to nitrogen, 2 to 2.9 per cent.) ; soluble phos- 

 phoric acid, 8 to 10 per cent. ; potassium oxide, 3 to 4 per 

 cent. 



Per cent. 



Moisture at 100° C, 11.18 



Total phosphoric acid, 12.17 



Soluble phosphoric acid, ...... 3.71 



Reverted phosphoric acid, .... 2.93 



