COMMERCIAL FERTILIZERS. 



211 



Soluble phosphoric acid, . 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid. 

 Potassium oxide, 

 Nitrogen, .... 

 Magnesium oxide, . 

 Insoluble matter. 



Valuation per two thousand pounds ; — 



142.6 pounds of soluble phosphoric acid, 

 19,6 pounds of reverted phosphoric acid, 

 42.2 pounds of insoluble phosphoric acid, 

 20. pounds of potassium oxide, . 

 44. pounds of niti'ogen, .... 



Per cent. 

 7.13 

 .98 

 2.11 

 1.30 

 2.20 

 1.30 

 6.35 



$15 69 



1 57 



2 53 

 1 11 



10 12 



$31 02 

 Darling^s Animal Fertilizer. 

 (Collected of Parker and Gannet, Boston, Mass.) 



Guaranteed composition : total phosphoric acid, 10 to 

 12 per cent. ; potassium oxide, 5 to 6 per cent. ; nitrogen, 

 4 to 6 per cent. 



Valuation per two thousand pounds : — 



2.6 pounds of soluble phosphoric acid, . 

 94. pounds of reverted phosphoric acid, 

 162.2 pounds of insoluble phosphoric acid, 

 60.6 pounds of potassium oxide, . 

 71.8 pounds of nitrogen, .... 



$36 63 

 Sparrow''s Bone and Potash Phosphate. 

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



Guaranteed composition: soluble phosphoric acid, 9 to 

 11 per cent. ; potassium oxide, 4 to 5 per cent. ; ammonia, 



