50 



60 



Humidity 

 70 



80 



90 



70 



60 



250 

 I 



H 



United States north of 40 and east 

 of Missouri River. 



(1900-1912) 

 ^,500,000 deaths. 



10 



Graph 



of 

 Hew York 



FIG. 31. Climograph of the northeastern United States. Based on about 

 2,500,000 deaths in the United States north of 40 latitude and east of the 

 Missouri River, 1900-1912. 



