MANUEE FRO:^! DIFFERENT SUBSTANCES. 167 



The raw material of crops is manure, and barn-manure is 

 the type by which others are compared, and in many cases 

 stock is kept expressly to manufacture it to keep up the value 

 of the farm. Fodder is raised, not, with a view to obtain 

 meat, but in order to have dung ; and it should be known 

 what it costs to make it, what it is worth when made in com- 

 parison with other, the value of it to use, and for what crops 

 it is best adapted according to what it is fed, and whether to 

 growing, milk or fattening stock will its value be ; and the 

 variations are large, as will be noticed by the following table 

 of the value of the manure made from diiferent materials or 

 crops : — 



AvEKAGE Composition, per cent, and per ton. of various kinds of Agricul- 

 tural produce, etc. 



* Reckoned as Phosphate of Lime. 



The following experiments, conducted with great care at 

 the barn connected with the Merrimac Print Works, in Lowell, 



