12 



The call for free analysis has gradually reached such proportions 

 that the expenses necessarily incurred in the worii have become a 

 serious feature in the management of the financial resources at our 

 disposal. 



It is to be hoped that all parties interested in this important work 

 of the Station will aid us by complying with our request. 



IV. 



DISCUSSION OF TRADE VALUES OF FERTILIZING INGRE- 

 DIENTS IN RAW MATERIALS AND CHEMICALS. 



1901.1900. 



Cents per pound. 



Nitrogen in ammonia salts, 



" nitrates, 



Organic nitrogen in dry and fine ground fish, meat, blood, 



and in high-grade mixed fertilizers, 

 " " " fine bone and tankage, 



" " " medium bone and tankage, 



Phosphoric acid soluble in water, 



" " soluble in ammonium citrate, 



" " in fine ground fish, bone and tankage, 



" "in cottonseed meal, castor pomace 



and wood ashes, 

 " "in coarse fish, bone and tankage, 



" " insoluble (in water and in am. cit.) 



in mixed fertilizers. 

 Potash as Sulphate, free from Chlorides, 

 " " Muriate, 



The market value of low priced materials used for manurial pur- 

 poses, as salt, wood ashes, various kinds of lime, barnyard manure, 

 factory refuse and waste materials of different description, quite 

 frequently does not stand in close relation to the current market 

 value of the amount of essential articles of plant food they contain. 

 Their cost varies in different localities. Local facilities for cheap 

 transportation and more or less advantageous mechanical conditions 

 for a speedy action, exert as a rule, a decided influence on their 

 selling price. 



The market cost of the different essential elements of plant food, 

 with the exception of the nitrogen compounds and available phos- 

 phoric acid compares favorably with the prices of the same ingredients 

 for the year 1900. Nitrogen compounds with the exception of the 



