CONTROL SERIES No. 69 



Pulverized Animal Manures — Continued 



Note: The sum of the organic matter and moisture, subtracted from 100, gives the mineral 

 matter, which is largely inert, earthy material. 



Stone Meal. 



No water soluble potash was found or guaranteed in either product. 



Occasional inquiries come to us regarding the value, both commercial and 

 agricultural, of these two Stone Meals. Obviously, both the commercial and 

 agricultural value of any material as a fertilizer must depend largely upon the 

 amount of available plant food which the product supplies. The chemical 

 analysis of metamorphic rocks shows the presence of several substances which 

 make up the greater bulk of such rocks but which can have only a very limited 

 intrinsic or agricultural value; in fact, soils themselves are made up largely of 



