SOILS. 



ii 



Table 2. 



AVERAGE COMPOSITION OF FRESH MANURES (WOLF). 



This valuation is based on 15 cents for nitrogen and 5 cents for 

 phosphoric acid and potash. 



Table 3. 



AVERAGE COMPOSITION OF MANURES (WITHOUT LITTER) 

 CORNELL EX. STATION. 



The valuation in table 3 is ibased on nitrogen at 15 cents per pound, 

 phosphoric acid at 6 cents and potash at 4.5 cents per pound. 



A comparison of the foregoing tables showing the value 

 and composition from various experiment stations will show a 

 variation, but they go to prove the accuracy of scientific investiga- 

 tion, for in each case there are differences in composition that 

 are governed by species, type, age of animal, condition and 

 character of food. 



For instance, Roberts has calculated that the value of the 



