THE HISTORY OF DRY-FARMING 381 



expected. For instance, he believed so thoroughly 

 in the value of cultivation of the soil, that he thought 

 it would take the place of all other methods of main- 

 taining soil-fertility. In fact, he declared distinctly 

 that "tillage is manure," which we are very certain 

 at this time is fallacious. Jethro Tull is one of the 

 great investigators of the world. In recognition 

 of the fact that, though living two hundred years 

 ago in a humid country, he was able to develop 

 the fundamental practices of soil culture now used 

 in dry-farming, the honor has been done his memory 

 of placing his portrait as the frontispiece of this 

 volume. 



