322 



BOAED OF AGRICULTUEE. 



Valuation per two thousand pounds : — 



167. pounds of soluble phosphoric acid, 

 87.4 pounds of reverted phosphoric acid, 

 1G.4 pounds of insoluble phosphoric acid, 

 32.G pounds of potassium oxide, 

 63.6 pounds of nitrogen, 



Bowker''s Hill and Drill Phosphate. 

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



$16 70 



3 37 



74 



1 39 



10 72 



$32 92 



Guaranteed composition : Ammonia, 2 to 3 per cent, 

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

 phoric 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 



Total phosphoric acid, 

 Soluble phosphoric acid, 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid, 

 Potassium oxide. 

 Nitrogen, 

 Insoluble matter. 



11.74 

 5.24 

 2.89 

 3.61 

 2.08 

 3.01 

 3.28 



Valuation per two thousand pounds : — 



104.8 pounds 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 



