310 BOAED OF AGKICULTUEE. 



83. pounds of potassium oxide, $3 53 



48.8 pounds of nitrogen, 9 76 



$30 81 

 Sparrow's Bone and Potash. 

 ( Judson & Sparrow, Boston, Mass. ; collected of Gleason & Everett, Boston, Mass.) 



Guaranteed composition : Ammonia, 3 to 4 per cent, 

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

 reverted phosphoric acid (available), 8 to 9 per cent. ; potas- 

 sium oxide, 4 to 5 per cent. 



Per cent. 



Moisture at 100° C, ....... 13.65 



Total phosphoric acid, 11.13 



Soluble phosphoric acid, 8.64 



Reverted phosphoric acid, 1.87 



Insoluble phosphoric acid, .62 



Potassium oxide, 4.04 



Nitrogen, 3.05 



Valuation per two thousand pounds : — 



172.8 pounds of soluble phosphoric acid, . . . $17 28 



37.4 pounds of reverted phosphoric acid, . . .3 37 

 12.4 pounds of insoluble phosphoric acid, ... 56 



80.8 pounds of potassium oxide, 3 43 



61. pounds of nitrogen, 12 20 



$36 84 



Standard Superphosphate. 



(Standard Fertilizer Co., Boston, Mass. ; collected of C. H. Thompson & Co., Bos- 

 ton, 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. ; insoluble phosphoric 

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



Per cent. 



Moisture at 100° C, 12.19 



Total phosphoric acid, 13.25 



Soluble phosphoric acid, 5.67 



Reverted phosphoric acid, 4.50 



Insoluble phosphoric acid, 8.08 



Nitrogen, 2.22 



Potassium oxide, 2.58 



Insoluble matter, 6.99 



