VALUATION OF ESSENTIAL INGREDIENTS. 389 



Valuation of Nitrogen, Phosphoric Acid and Potassium Oxide, ivith refer- 

 ence to the particular form ; i. e., chemical and mechanical condition in 

 which they enter our market, either as fertilizers or as material for the 

 manufacture of the latter. 



Percentage. 



Price per 

 Ton. 



Cost of lib. 

 of Nitrogen" 



New York, 

 Boston, 



Sulphate of ammonia (22 per cent, 

 of nitrogen) 



Chili saltpetre (15 per cent, of ni- 

 trogen), 



Potash saltpetre (nitre) (50 per ct. ' 

 nitric acid equals 13 per cent, of 

 nitrogen and 45 per cent, potas- 

 sium oxide, the latter at 10 cents 

 per pound), 



90 

 92 



9.5 



$115 00 

 80 00 



$0 27.0 

 26.6 



30.0 



t These substances contain a small per cent, of phosphoric acid, which is soluble in citrate 

 of ammonia; for this is charged 13 cents, and for the remaining amount, 6 cents per pound. 



