New York Agricultural Experiment Station. 131 



kainit, 8 pounds of kainit containing 1 pound of potash. Then we 

 can tabulate our statement as follows : 



Pounds. 



Dried blood required to furnish 1 pound of nitrogen 10 



Bones, etc., required to furnish .t potmds of available and 1 pound insolu- 

 ble ])ho8phoric acid 24 



Kainit equivalent to 1 pound of potash 8 



Moisture, dirt, etc 58 



Total 100 



We could, of course, vary the sources of materials used and get 

 other figures, but these illustrations serve to give a fair idea of what 

 a hundred pounds of a fertilizer may be made, and why a state- 

 ment of analysis does not account for more than 20 or 30 pounds of 

 fertilizing materials in a hundred pounds of fertilizer. 



Commercial Valuation of Fertilizers. 



What is a Commercial Valuation of a Fertilizer ? — The com- 

 mercial valuation of a fertilizer consists in estimating the approxi- 

 mate value or money-cost of the essential fertilizing ingredients 

 (nitrogen, 23ho6phoric acid, and potash) in one ton of fertilizer. 



In making a commercial valuation of a fertilizer, one uses either 

 the figures given in the guarantee-analysis or preferably the figures 

 given in the Station's analysis, as a basis for calculation. This 

 enables one to know how many pounds of nitrogen, of phosphoric 

 acid and of potash there are in one ton of fertilizer. 



The prices to be used in calculating a commercial valuation are 

 furnished in a schedule prepared annually by experiment stations. 

 This price-list for the year 1895 we give below. 



Prices of Nitrogen, Phosphoric Acid and Potash Adopted by 

 Experiment Stations. — The trade-values in the following schedule 

 represent the average prices at which, in the six months preceding 

 March the respective ingredients, in the form of unmixed raw 

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

 Boston, Kew 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 whole- 

 sale quotations. 



It must be kept in mind that these trade-values are changing 

 from time to time. In the fertib'zer bulletins, which are issued not 

 less often than twice a year, we always give the latest trade-values 



