512 



INDEX 



Glacial epoch, duration of, 108 ; sub- 

 divisions of, 109. 



Gonorrhoea, effect upon fecundity, 89. 



Greece, discussion regarding population 

 in, 19 ; celibacy, 251 ; contraceptive 

 methods, 255 ; abortion, 256 ; in- 

 fanticide, 258 ; malaria, 349. 



Grimaldi man, 117. 



Guanas, fertility, 168 ; infanticide, 169 ; 

 age at marriage, 230. 



Guaranis, fertility, 168 ; war, 171 ; 

 abortion, 220. 



Guatemala, early intercourse, 164. 



Guaycurus, abortion, 146 ; infanticide, 

 149 ; war, 152. 



Guiana, lactation, 165 ; infanticide, 

 169 ; feuds, 171 ; marriage customs, 

 229 ; food, 234. 



Habit, inheritance of, 362 : tradition 

 and, 414, 462. 



Haidahs, abortion, 146 ; infanticide, 

 149 ; war, 151 ; feuds, 154 ; pro- 

 perty, 206 ; marriage customs, 225. 



Hausa, lactation, 174 ; restriction of 

 intercourse, 175 ; infanticide, 180. 



Hawaii, early intercourse, 185 ; abor- 

 tion, 189. 



Head, shape of, and environment, 341. 



Head-hunting, 194. 



Health, of primitive races, 158, 196, 

 231 ; of historical races, 245. 



Heidelberg man, 114. 



Hobbes, restriction of intercourse, 175. 



Hottentots, fertility, 178 ; infanticide, 

 179, 180; war, 182; health, 183; 

 property, 208. 



Housing accommodation, population 

 and, 280. 



Hualaga tribes, fertility, 168. 



Hudson Bay tribes, fertility, 143 ; 

 abortion, 145. 



Hungary, lactation, 263. 



Hurons, early intercourse, 165. 



Ibo-speaking people, early intercourse, 

 173. 



Ice Age, see Glacial epoch. 



Illinois, early intercourse, 165 ; restric- 

 tion of intercourse, 166. 



Imitation, inheritance of, 364 ; tradi- 

 tion and, 413. 



Income, average per head, 310. 



Increase, possible among animals and 

 plants, 54 ; actual, 55. 



India, fecundity, 100 ; early inter- 

 course, 104 ; infant mortality, 250 ; 

 celibacy, 251 ; early intercourse, 253 ; 

 contraceptive methods, 255 ; fertility, 

 255 ; abortion, 256.; infanticide, 

 260 ; climate, 274 ; over-population, 

 275 ; caste system, 432. 



Infant mortality, see Children. 



Infanticide, hunting and fishing races, 

 146 ; agricultural races, 169, 179, 

 190,^ 196 ; extent of under-estimated, 

 215; origin of, 216; importance of, 

 in regulating numbers, 228 ; among 

 historical races, 257, 268. 



Ingaliks, lactation, 138. 



Inheritance, relation of, to social pro- 

 blems, 18 ; physical basis of, 64 ; 

 biparental, 71 ; environment and, 

 326 ; in man, 356 ; of physical 

 characters, 359 ; of disease, 359 ; of 

 mental characters, 361. 



Initiation ceremonies, 138. 



Instinct, nature of, 47 ; inheritance of, 

 363. 



Intellect, inheritance of, 364 ; among 

 prehistoric races, 387, 398 ; primitive 

 races, 389 ; negroes, 393 ; in the 

 Bahamas, 396 ; evolution of, 399, 

 409, 438 ; influence upon progress, 

 447. 



Intelligence, nature of, 47 ; develop- 

 ment among animals, 50. 



Interdependence of organisms, 56. .^ 



Ireland, over-population, 284, 294. H 



Iron Age, 127. 



Iroquois, restriction of intercourse, 166 ; 

 fertility, 167 ; health, 172. 



Jakun, marriage customs, 225. 



Japan, rise of, 82. 



Java, early intercourse, 185 ; fertility, 



189 ; health, 343. 

 Jews, contraceptive methods, 255 ; 



infanticide, 256 ; civilization, 452. 



Kabinapek, abortion, 146 ; infanticide, 



149. 

 Kaffirs, see South Africa. 

 Kagero, lactation, 174 ; restriction of 



intercourse, 175 ; infanticide, 180 ; 



food, 234. 

 Kalabar, witchcraft, 182. 

 Kalmucks, marriage customs, 253. 

 Kamtchatka, age at marriage, 196 ; 



abortion, 196 ; infanticide, 196. 

 Kenai, marriage customs, 225. 

 Kingsmill Islands, restriction of inter- 

 course, 186 ; fertility, 188 ; abortion, 



189 ; infanticide, 190, 219 ; war, 192. 

 Kirghiz, early intercourse, 254. 

 Knisteneaux, abortion, 146. 

 Konde-land, restriction of intercourse, 



176. 

 Koniagas, infanticide, 149. 

 Koryak, lactation, 196. 

 Kuku, lactation, 174 ; restriction of 



intercourse, 176 ; fertility, 178 ; 



marriage customs, 228. 

 Kutchins, infanticide, 148 ; celibacy, 



226 ; health, 233. 

 Kwakiutl, war, 151. 



