36 Report of the Chemist of the 



could be bought at retail for cash in our large markets, Boston, 

 New York and Philadelphia. These prices also correspond to 

 the average wholesale prices for the six months preceding 

 March, plus about 20 per cent, in case of goods for which there 

 are wholesale quotations. 



Trade-values of Fertilizing Ingredients in Raw Materials and 

 Chemicals, Adopted by Experiment Stations. 



1897. 

 Ct8. per 

 pound . 



Nitrogen in ammonia salts 13i/^ 



Nitrogen in nitrates 14 



Organic nitrogen in dry and fine-ground fisli, meat and blood, and 



in high-grade mixed fertilizers 14 



Organic nitrogen in cotton-seed meal and castor-pomace 12 



Organic nitrogen in fine-ground bone and tankage 13% 



Organic nitrogen in fine-ground medium bone and tankage 11 



Organic nitrogen in medium bone and tankage 8 



Organic nitrogen in coarser bone and tankage 3 



Organic nitrogen in hair, horn-shavings and coarse fish-scraps.... 3 



Phosphoric acid, soluble in water 5^^ 



Phosphoric acid, soluble in ammonium citrate 5 



Phosphoric acid in fine bone and tankage 5 



Phosphoric acid in fine medium bone and tankage 4 



Phosphoric acid in medium bone and tankage 2%! 



Phosphoric acid in coarser bone and tankage 2 



Phosphoric acid in fine-ground fish, cotton-seed meal, castor-pomace 



and wood ashes 4i/^ 



Phosphoric acid, insoluble in ammonium citrate, in mixed fertiliz- 

 ers 2 



Potash as high-grade sulphate, in forms free from muriates (chlor- 

 ides), in ashes, etc 5 



Potash in muriate 4^^ 



Commercial Valuation of Fertilizers. 



The commercial valuation of a fertilizer consists in estimating 

 the approximate value or money-cost of the essential fertilizing 

 constituents (nitrogen, phosphoric acid and potash) in one ton 

 of fertilizer. This does not take into consideration cost of mix- 



