PEEPAEATION OF THE SOIL. 117 



language contain them ; for there is no reason to doubt 

 that, if a more thorough system of tillage were prac- 

 tised by every one of our four million farmers, it would 

 add to the corn-crop of this country, in a single season, 

 many million bushels. 



LI BE A !|1 : 



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CALIFORNIA 



