51 
Illinois is, indeed, seriously defective in the fact that the plants 
composing it—Indian corn, small grains, and grasses—are all 
of the same botanical family and consequently subject in large 
measure to the same enemies. Any variation of this system 
which will introduce as a regular link in the chain a crop be¬ 
longing to some other and widely different family of plants, 
wilf serve the general purpose of that here proposed. 
