FOR BKTTKI! CHOPS 23 



though high-priced grains and animal products are sold from the 

 farm. It is a system under which the land grows richer and 

 richer and more and more productive and valuable, instead of 

 becoming poorer and less productive, as has been the case with 

 by far the larger part of the older cultivated lands in the United 

 States. 



For more complete data, simple discussion, and plain explana- 

 tion of the most essential information the world affords, relating 

 to soils and methods of soil improvement, the reader is referred 

 to a book on "Soil Fertility and Permanent Agriculture,*' puV> 

 lished by Ginn & Company, of Boston, Massachussetts. 



