82 



CORN CROPS 



were due to natural hybridization, as this is likely to take 

 place to some extent in a neighborhood where any two fields 

 are less than twenty to forty rods distant from each other. 



Fig. 27. — Relation of type to climate. The short type on left is better 

 adapted to dry regions than the tall, more slender type. The tall 

 type is adapted to warm, more humid regions. 



Crossing as a means of securing new forms was often 

 practiced, and a method is outlined by Enfield (1866) .^ 

 1 Enfield, Edwakd. (1866.) Indian Corn, pp. 70-74. 



