312 



BOAED OF AGKICULTUKE. 



Per cent. 



Nitrogen (in organic matter), .75 



Potassium oxide, 6.64 



Chlorine, 16.36 



Sulphuric acid, 16.02 



Insoluble matter, .20 



Valuation per two thousand pounds : — 



12.2 pounds of soluble phosphoric acid, 

 49.6 pounds of reverted phosphoric acid, 



187.6 pounds of insoluble phosphoric acid, 

 15. pounds of nitrogen, 



132.8 pounds of potassium oxide, 



$26 75 



Standard Superphosphate. 



(Standard Fertilizer Co., Boston, Mass. ; collected of Slate & DeWolf, Greenfield, 



Mass.) 



Guaranteed composition : Ammonia, 3 to 4 per cent, 

 (equivalent to nitrogen, 2.5 to 3.3 per cent.) ; available 

 phosphoric acid, 9 to 13 per cent. ; soluble phosphoric acid, 

 2 to 3 per cent. ; potassium oxide, 2 to 4 per cent. 



Per cent. 



Moisture at 100° C 12.30 



Total phosphoric acid, 12.69 



Soluble phosphoric acid, 3.52 



Reverted phosphoric acid, 4.51 



Insoluble phosphoric acid, 4.66 



Potassium oxide, '2.34 



Nitrogen, 8.11 



Valuation per two thousand pounds : 



70.4 pounds of soluble phosphoric acid, 

 90.2 pounds of reverted phosphoric acid, 

 93.2 pounds of insoluble phosphoric acid, 

 46.8 pounds of potassium oxide, 

 62.2 pounds of nitrogen, 



$33 78 



Bradley^ Sea Fowl. 

 (Collected of Sheldon & Newcomb, Greenfield, Mass.) 

 Guaranteed composition: Nitrogen, 2| to 3^ per cent, 

 (equivalent to ammonia, 3 to 4 per cent.) ; soluble phos- 

 phoric acid, 7 to 8 per cent. ; available phosphoric acid, 9 to 

 11 per cent. ; insoluble phosphoric acid, 2 to 3 per cent. ; 

 potassium oxide, 2 to 3 per cent. 



