INDEX 



279 



effect on diseases, 137 ff. ; 



effect on evolution, 107 ff., 123; 



in Rome, 186 ff. (see Variability) 

 Climbing perch, 109 

 Climograph, construction of, 249 ff. ; 



defined, 63, 254; 



of contagious diseases, 91; 



of France, 64 ff.; 



of Italy, 68 f.; 



of negroes, 70 f . ; 



of United States, 70 ff.; 



of white race, 70 f . 

 Coal, consumption in United States, 



272 

 Cold, effect on butterflies, 150 ff.; 



effect on evolution, 112 f., 117, 121; 



effect on mutation, 154 f. 

 Colds, causes of, 270 

 Cologne, inundation of, 133 

 Comfort, effect of humidity on, 

 268 ff.; 



scale, 268 f. 

 Commodus, 204 



Complexion, effect of humidity on, 

 270; 



effect of New York upon, 176; 



of Jews, 170 ff. 

 Connecticut, variations in deathrate, 



30 f. 

 Constantinople, agriculture near, 

 216 ff.; 



climate of, 218, 222 

 Contagious diseases, climograph of, 



91 

 Cope, Ellen, 79 



Copenhagen, bracing climate of, 222 

 Copper smelting, origin of, 122 

 Cotton-boll weevil, 255 

 Crayfish, curve of activity, 156 

 Credit, in America vs. France, 44 

 Crinoids, mutations of, 162 f. 

 CroU, James, cited, 125 

 Cro-Magnon Race, 121 f . ; 



entrance to Europe, 141 



Crops, and economic cycles, 26 f ., 28, 

 41 ff., 54; 

 insurance on, 224 f . ; 

 value compared with health, 53 

 Crossbills, asymmetry among, 163 

 "Crossing-over," 155 f. 

 Cycles in business, causes of, 26 



(see Economic cycles) 

 Cyclonic storms, relation to sun, 129 



Dante, 147 



Danube, floods of, 132 f. 



Dark Ages, relation to climate, 206 



Darwin, 17, 24, 148; 



ill health of, 232 

 David, energy of, 228 

 Deathrate, effect of drought on, 139; 



effect of indoor humidity on, 271; 



effect of weather on, 60 ff. ; 



in New York City, 60; 



relation to humidity, 67 ff . ; 



relation to temperature, 67 ff. ; 



seasonal variations of, 61 ff. ; 



secular trend of, 245; 



variations in United States, 30 f . 

 (see Health) 

 Deaths, daily in New York City, 



88 ff.; 

 • effect of temperature on, 59; 



fluctuations in Chicago, 249 f . ; 



from epidemics, 60; 



methods of tabulating, 89; 



monthly fluctuations in, 249 f . ; 



yearly fluctuations in, 249 f . 

 Death-tax, 52 f. 



Debt, relation to climate, 201 f. 

 Depopulation, in Rome, 205 

 Dersim, Kurds of, 213, 215 

 Desert Laboratory, 152 

 Devonian Period, fishes in, 109 

 Diphtheria, deathrate from, 60 

 Directions for ventilation and humid- 

 ity, 274 ff. 

 Draft, revelations as to health, 21 



