PAPERS ON ZOOLOGY 



100^ 



Fig. 3. Climograph for the death-rate of man shown with hori- 

 zontal rulings. The broken lines (O'^r) ai-e drawn along the combined 

 temperature and humidty conditions under which the death-rate is 

 normal and hence the deviation from normal 0^7 ; for the white man. 

 The curve bounding the sparsely ruled area and labeled ICf^r passes 

 through the temperature and humidity conditions in which the death- 

 rate is 10^"f below normal for the white man; the lowest death-rate 

 65°F. and 80 per cent humidity is shown by a black dot. The closely 

 ruled area shows a death rate 107^ less than normal for the negro 

 and the x is placed near its center on a humidity of SI per cent and 

 a temperature of 6S = F. (after Huntington). The vertically ruled areas 

 indicate the deaths (Cf individuals) of codlin moth pupae under ex- 

 perimental conditions. 



