INDEX 



283 



Land question, in Rome, 198 f. 



Latin Races, variability among, 168 



Laws, relation to economic cycles, 27 



Legs, evolution of, 109 



Lehmann, cited, 75 



Leonardo da Vinci, 146 



Liebig, J. von, cited, 197 



Life, value of, 51 



Lincoln, Abraham, a variant, 164 



Literature, and climate, 147 



Loess, in Europe, 140 



Lop-Nor, fluctuations of, 131 



Lull, R. S., cited, 124 



Lung fish, 108 



Lungs, evolution of, 109 



Macchiavelli, a variant, 164 f . 

 MacDougal, D. T., cited, 150 

 Malaria, in ancient Rome, 200 f . 

 Malnutrition, effect on health, 135 

 Mammals, extinction of, 115 ff., 

 256 ff.; 

 origin of, 111 

 Man, adaptation to climate, 106 ff . ; 

 entrance of prehistoric to Europe, 



141; 

 origin of, 115 ff. 

 Marius, 202 

 Massachusetts, variations in death 



rate, 30 f., 61 f. 

 Massacres, in Turkey, 208, 210 f. 

 Matthews, W. F., cited, 256 ff. 

 Maxims, 205 

 Mediterranean climate, effect on 



blondness, 171 

 Mediterranean Race, entrance to Eu- 

 rope, 122, 141 

 Mendelian inheritance, 153 f . 

 Mental evolution, 84; 

 conditions of, 84, 107; 

 effect of Glacial Period on, 116; 

 environment of, 124 ff. 

 Mental optimum, 75 

 Mental Power, curve of, 34 f. 



Metamorphosis of insects, origin of, 



112, 152 

 Mice, mutation of, 159 ff. 

 Michael Angelo, 146 

 Migrations, among animals, 149; 



effect on human races, 184 

 Mind, sensitiveness of, 232 

 Miocene mammals, 257 f. 

 Mississippian Period, evolution in, 109 

 Mixture of races, 166 f. 

 Moisture, effect upon comfort, 266 ff. 

 Moore, H. L., cited, 42 

 Morgan, T, H., cited, 153 

 Mother-love, origin of, 112 

 Mucous membranes, effect of dry air 



on, 270 

 Muhajir Turks, 219 

 Mutation, among flies, 153 ff. ; 



causes of, 149 ff.; 



of beetles, 152 f . ; 



of butterflies, 150 f.; 



of mice, 159 ff.; 



of nurse-toad, 157 



Naples, rainfall of, 189 

 Natural selection, 148 

 Neanderthal Race, extinction of, 141 

 Negroes, compared with Jews, 168; 



evolution of, 84; 



deathrate among, 70 f . ; 



mental optimum of, 79 f . ; 



optimum temperature of, 75 

 Nero, a variant, 164, 204 

 Nerva, 204 



New York City, bank clearings and 

 health, 37; 



bank clearings in, 245 f . ; 



bureau of Child Hygiene in, 101; 



climate compared with Russia, 233; 



daily deaths in, 88 ff . ; 



effect of temperature on deaths, 59; 



Jews and Negroes in, 169; 



method of tabulating deaths in, 89; 



