6 



Phosphoric acid soluble in water, 5.5 



" " soluble in ammonium citrate, 5. 



'* " in fine bone and tankage, 5. 



" " in medium bone and tankage, 4. 



" "in coarse bone and tankage, 2.5 



" " in fine ground fish, cottoo-seed meal, linseed 



meal, castor pomace and wood ashes, 5. 



" " insoluble (in am. cit.) in mixed fertilizers, 2. 



Potash as Sulphate, free from Chlorides, 5. 



" " Muriate, 4.5 



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 a 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 sell- 

 ing price. 



The mechanical condition of any fertilizing 7naterial, simple or com- 

 pound, deserves the most serious consideration of farmers, when 

 articles of a similar chemical character ai-e offered for their choice. 

 The degree of pulverization controls almost without exception, under 

 similar conditions, the rate of solubility, and the more or less rapid 

 diffusion of the different articles of plaut-food throughout the soil. 



The state of moisture exerts a no less important influence on the 

 pecuniary value in case of one and the same kind of substance. Two 

 samples of fish fertilizers, although equally pure, may differ from 50 

 to 100 per cent in commercial value, on account of mere difference 

 in moisture. 



Crude stock for the manufacture of fertilizers, and refuse materials 

 of various descriptions, have to be valued with reference to the 

 market price of their principal constituents, taking into consideration 

 at the same time their general fitness for speedy action. 



Consumers of commercial manurial substances will do well 

 to buy whenever practicable, on a guarantee of composition of 

 their essential constituents ; and to see to it that the bill of sale 

 recognizes the point of the bargain. Any mistake or misunder- 

 standing in the transaction may be readily adjusted, in that case, 



