INDEX 



511 



Corea, celibacy, 252. 



Creeks, infanticide, 169, 220. 



Crees, war, 211. 



Cro-Magnon man, 117. 



Cross River tribes, early intercourse, 



172. 

 Crow tribe, fertility, 99 ; restriction of 



intercourse, 166 ; abortion, 168 ; 



war, 170. 

 Cytoplasm, nature of, 39 ; relation to 



nucleus, 66. 



Dacotahs, war, 170. 



Dahomey, war, 170. 



Damaras, health, 175. 



Death, origin of, 38 ; causes of, among 

 animals, 57 ; among plants, 58 ; 

 ignorance of cause among hunting 

 and fishing races, 153. 



Decreasing returns, 199. 



Development of organisms, 41, 66, 325. 



Disease, evolution of, 155 ; among 

 hunting and fishing races, 158 ; 

 among agricultural races, 171, 183, 

 195 ; among historical races, 244 ; 

 tropical, 348 ; twins and, 352 ; inheri- 

 tance of, 359 ; selection and, 377. 



Ductless glands, 347, 372. 



Dyaks, use of metal, 163 ; food, 233. 



Egbas, fertility, 177. 



Egypt, disease, 245, 247 ; treatment of 

 children, 250 ; celibacy, 251 ; lacta- 

 tion, 254 ; restriction of intercourse, 

 254 ; infanticide, 272 ; over-popula- 

 tion, 277. 



Ekoi, fertility, 177 ; property, 209 ; 

 marriage customs, 229. 



Elimination, causes of among animals, 

 58 ; among plants, 59 ; under natural 

 conditions, 75. 



Enclosures, population and, 284. 



Environment, influence of upon animals 

 and plants, 325 ; upon men, 336 ; 

 influence upon progress, 458. 



Eoanthropus, 115. 



Eoliths, 118, 130. 



Eskimos, fertilitj^, 99, 143 ; early inter- 

 course, 136 ; lactation, 137 ; age at 

 marriage, 140 ; abortion, 145 ; in 

 fanticide, 148 ; war, 150 ; feuds, 

 153 ; treatment of aged, 154 ; health, 

 158 ; infant mortality, 159 ; pro- 

 perty, 205 ; division of food, 212 ; 

 marriage customs, 225 ; " celibacy, 

 226 ; storing of food, 232. 



Eugenics, attitude of Romans, 18 ; 

 term due to Galton, 35 ; modern 

 problems, 308. 



Evolution, theory of, 17, 18, 34 ; of 

 animal behaviour, 45 ; among species 

 in a state of nature, 77 ; of Primates, 

 109; of man, 110, 128; of culture, 



129 ; of disease, 155 ; of tradition, 



438. 

 Ewe-speaking people, lactation, 174 ; 



restriction of intercourse, 175 ; war, 



180 ; property, 209 ; marriage, 229. 

 Exercise, influence of, 329, 339. 



Factory Acts, 290, 340. 



Famine, climate and, 249. 



Fecundity, early references to human, 

 25 ; definition of, 51 ; distinguished 

 from fertility, 52 ; among species in 

 nature, 63 ; how determined, 60 ; 

 not influenced by the male, 88 ; rela- 

 tion to length of mature period, 90 ; 

 to interval between births, 92 ; effect 

 of captivity upon, 95 ; relation to 

 number at a birth, 95 ; increase of 

 human, 97 ; of primitive races, 99 ; 

 in India and China, 100 ; opinion of 

 Darwin regarding, 101 ; relation to 

 polygamy, 102 ; to lactation, 102 ; 

 to age at marriage, 103 ; to early 

 intercourse, 103 ; to development of 

 fat, 104 ; among men, 105 ; of pre- 

 human ancestor, 241. 



Fertility, distinguished from fecundity, 

 52 ; among hunting and fishing races, 

 141 ; among agricultural races, 167, 

 177, 183, 196; among historical races, 

 255 ; Indian and European com- 

 pared, 256 ; calculations regarding, 

 291 ; differential, 316 ; differential 

 between classes, 316, 457 ; between 

 races, 320. 



Fertilization, 40. 



Feuds, among hunting and fishing races, 

 152 ; among agricultural races, 171. 



Fiji, lactation, 185 ; restriction of inter- 

 course, 186 ; fertility, 188 ; abortion, 

 189, 221 ; infanticide, 191, 219 ; war, 

 193 ; obligation to work, 212 ; age 

 at marriage, 226 ; food, 233. 



Flores, abortion, 190. 



Food, co-operation in search for, 211. 



Franks, contraceptive methods, 255. 



Fuegians, early intercourse, 137 ; lacta- 

 tion, 138 ; fertility, 144 ; abortion, 

 146; infanticide, 149; war, 152; 

 treatment of aged, 155 ; infant mor- 

 tality, 160 ; restriction of intercourse, 

 166 ; property, 207 ; marriage cus- 

 toms, 225. 



Funafuti, infanticide, 190, 219. 



Gallinomero, infanticide, 149. 



Gallinas, restriction of intercourse, 175 ; 

 war, 180. 



Gametes, nature of, 40. 



Geological strata, time occupied by 

 deposition of, 107. 



Ghiliaks, lactation, 138 ; infant mor- 

 tality, 160. 



