372 



BOARD OF AGRICULTURE. 



Insoluble phosphoric acid, 



Potassium oxide, 



Nitrogen, 



Insoluble matter, 



Valuation per two thousand pounds 



161. 2 pounds of soluble j^hosphoric acid, 

 50.2 pounds of reverted phosphoric acid, 

 53 8 pounds of insoluble phosphoric acid, 

 20. poimds of potassium oxide, . 

 59.4 pounds of nitrogen, 



Cumberland Siiperijhosphate . 



Per cent. 



2.69 

 1.00 

 2.97 

 4.92 



$12 90 



3 77 



1 61 



85 



10 10 



$29 23 



(Cumberland Bone Company, Portland, Me.; collected of G. B. Knowlton, Fitch 



biirg, Mass ) 



Guaranteed composition : Moisture, 14 to 15 per cent. , 

 total phosphoric acid, 11 to 14 percent. ; 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 oxide, 2 to 3 per cent. ; nitrogen, 2 to 3 per cent. 

 (equivalent to ammonia, 2.41 to 3.64 per cent.). 



Per cent. 



Moisture at 100° C , 18.62 



Total phosphoric acid, 12.20 



Soluble phosphoi-ic acid, 6.91 



Reverted phosphoric acid 3 13 



Insoluble phosphoric acid. ...... 2.16 



Potassium oxide, 2.91 



Xitrogen, 2.93 



Insoluble matter, . ...... 3.56 



Valuation per two thousand pounds : — 



138.2 pounds of soluble phosphoric acid, 

 02.6 pounds of reverted phosphoric acid, 

 43 2 pounds of insoluble ishosj^horic atnd, . 

 58.2 pounds of potassium oxide, . 

 58 6 jDounds of nitrogen, .... 



$29 49 



Sjyear'fi Perfect Fertilizer. 

 (Collected of Benjamin Spear & Co , Springfield, Mass.) 



Guaranteed composition: Total phosphoric acid, 3.1 per 

 cent.; potassium oxide, 2.1 per cent.; ammonia, 1.10 per 

 cent, (equivalent to nitrogen, .8 per cent.). 



