90° 



80° 



70° - 



60° - 



s. 



ii 

 H 



40" 



30° 



ao'- 



iOF 



50% 



-T — 



60% 

 I 



70% 



80% 

 — I — 



90% 



White - Hon- contagious. 

 United States (1912-1915) 921,000 deaths 



5 







-5 



5 





 • S 



-5 

 



-10 



.10 

 .5 







15 10 



Deaths in Relation to Temperature 

 and Humidity. 



J. 



Fig. 3. Climograph of 921,000 Deaths of White People in the Cities of the 



United States, 1912-1915. 



(From Huntington's World Power and Evolution, Yale Univ. Press.) 



I3O9I 



