CLIMATIC RELATIONS 



273 



be expected. The most striking of these, according to the informa- 

 tion of the statisticians here given, occur in South Dakota, where 



320 

 300 



220 

 200 



/eo 



/20 

 /OO 



20 

 O 



FIG. 79. Chart showing the period between seeding and harvesting 

 winter wheat in states east of the Rocky Mountains. 



the period is five days longer than in Nebraska on the south. The 

 explanation is said to be the common tendency of corn-growers in 



