14 



LIST OF ILLUSTRATIONS 



Figure Page 



21. The March of Geological Time . . . .110 



22. The Extinction of Mammalian Genera in North America 



and Europe . . , . . .114 



23. Climate and Life during the Glacial Period . . 126 



24. Climatic Pulsations of Historic Times . . 127, 188 



25. The Relation of Temperature to Variability in Dro- 



sophila . . . . . . .156 



26 A. The Distribution of Civilization .... 230 



26 B. The Distribution of Human Energy on the Basis of 



Climate 230 



27. Elimination of the Secular Trend .... 246 



28. Annual Deaths in Chicago, 1900-1915 . . . 250 



29. Monthly Deaths in Chicago, 1911-1915 . . . 251 

 80. Unsmoothed Climograph of France and Italy , . 262 



