CEREAL ADAPTATION AND ASSOCIATION 281 



often the reverse of that which is common. For instance, 

 spring wheats may be seen near Odessa and Kherson, 

 due south of winter wheat districts. 



FIG. 81. Map showing the distribution of wheat, in European Russia: 

 1, hard spring; 2, hard winter wheat; 3, durum wheat. 



295. The United States and Canada. Conditions in 

 the great cereal region of North America are radically 

 different from those of other regions in the respect that 



