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. 
