ILLUSTRATIONS xi 



Figure 34. CHmograph of deaths among colored people in the 

 eastern United States, 1912-1915. Non-contagious 

 diseases 168 



Figure 35. Climograph of deaths of white people in the eastern 



United States, 1912-1915. Non-contagious diseases 169 



Figure 36. The distribution of human energy on the basis of 



climate 173 



Figure 37. The distribution of civilization 173 



Figure 38. Changes of climate in the subtropical zone during 

 historic times, on the basis of the growth of trees in 

 California , . . . , 186 



