COMMERCIAL FERTILIZER. 359 



manner to the consumer, that leather refuse has been used 

 for the above purpose in the compounding of the article 

 offered for sale. To use ground leather refuse as a nitrogen 

 source in commercial fertilizers, without due notice to the 

 farming community, ought to be treated as a fraudulent 

 transaction, until some efficient preparatory treatment has 

 been found by which its nitrogen may be rendered available. 



E. Frank Cob's Ammoniated Bone Superphosphate, 



(Collected of J. Clark & Son, Worcester, Mass.) 



Per cent. 



Moisture, 22.20 



Total phosphoric acid, 11.01 



Soluble phosphoric acid, 8.06 



Reverted phosphoric acid, 1.20 



Insoluble phosphoric acid, 1.75 



Nitrogen, 2.81: 



Potassium oxide, 1.39 



Insoluble matter, 76 



Valuation per ton of two thousand pounds : — 



161.2 pounds of soluble phosphoric acid, 

 24.0 pounds of reverted phosphoric acid, 

 35.0 pounds of insoluble phosphoric acid, 

 56.8 pounds of nitrogen, 

 27.8 pounds of potassium oxide. 



Common- Sense Ferlilizer. 



$20 15 



2 16 



2 10 



13 63 



1 39 



$39 43 



(Sent on for examination by Messrs. Sheldon & Newcomb, Greenfield, Mass.) 



Per cent. 



Moisture, 14.14 



Organic and volatile matter, 44.62 



Ash constituents, 55.38 



Total phosjihoric acid, . 4.50 



Soluble phosphoric acid, 1.17 



Reverted phosphoric acid, 2.03 



Insoluble phosphoric acid, 1.30 



Nitrogen, 3 87 



Potassium oxide, 3.77 



Insoluble matter, 24.97 



Valuation per ton of two thousand pounds : — 



23 4 pounds of soluble phosphoric acid, . . . . $2 93 

 40.6 pounds of reverted phosphoric acid, . . . 3 84 



