DRY-FARMING 



parage Campbell's missionary work 

 among the farmers of the West. It is 

 often said, and truly so, that Jethro Tull 

 was the first exponent of the so-called 

 Campbell system of soil culture; but it 

 should not be forgotten that Tull did not 

 work under semi-arid conditions, and, 

 secondly, that although his practice was 

 successful his theories were erroneous. 

 Be that as it may the fact remains that a 

 great number of western farmers be- 

 lieve in Campbell's teaching and many 

 have followed his system or like methods 

 with success. 



The machine called the Campbell sub- 

 surface packer, under certain conditions, 

 gives good results; but it must be used 

 with care. It is seldom of much use on 

 soil that has had time to settle and be- 

 come packed. It is therefore more 

 valuable on spring than on fall plow- 

 ing, and where loose manure has been 

 146 



