208 



BOARD OF AGRICULTURE. 



per cent. ; potassium oxide, 3 to 6 per cent. ; ammonia, 5 to 

 6 per cent (equivalent to nitrogen, 4.1 to 5 per cent.). 



Valuation per two thousand pounds : — 



62. pounds of soluble phosphoric acid, . . . ?6 82 



31. pounds of reverted phosphoric acid, . . .2 48 



319. pounds of insoluble phosphoric acid, . . . 19 14 



22.8 pounds of i^otassium oxide, 97 



28. pounds of nitrogen (inorganic matter), . . 6 44 

 60.8 pounds of nitrogen (in ammonia salts), . .15 81 



$51 66 



MilchelVs Standard Phosphate. 

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



Guaranteed composition : total phosphoric acid, 12.42 per 



cent. ; soluble phosphoric acid, 9.85 per cent. ; insoluble 



phosphoric acid, 2.57 per cent. ; potassium oxide, 2.16 per 



cent. ; nitrogen, 2.G4 per cent. 



Per cent. 



Moisture at 100° C, ....... 16.10 



Total phosphoric acid, 11.56 



Soluble j^hosphoric acid, , 6.10 



Reverted phosphoric acid, .94 



Insoluble phosi^horic acid, 4.52 



Potassium oxide, 4.24 



Nitrogen, 2.23 



Insoluble matter, 6.15 



Valuation per two thousand pounds : — 



122. pounds of soluble phosphoric acid, 

 18.8 pounds of reverted phosphoric acid, 

 90.4 pounds of insoluble phosphoric acid, 

 84.8 pounds of jjotassium oxide, 

 44.6 pounds of nitrogen, , 



$34 20 



