516 



INDEX 



Under-population, 294, 295, 297. 

 Unemployment, over-population and, 



312. 

 Unit-factors, 71. 

 Utilitarian school, attitude to Malthus, 



29, 32. 

 Utis, contraceptive methods, 167. 



Vaitapu, infanticide, 191, 221. 



Vancouver Island, fertility, 99 ; age at 

 marriage, 140 ; abortion, 146. 



Veddahs, early intercourse, 137 ; age 

 at marriage, 140 ; fertility, 145 ; 

 infanticide, 149 ; infant mortality, 

 160 ; property, 207. 



Venereal disease, 269. See also Gonor- 

 rhoea. 



Wadschagga, lactation, 174 ; infant 

 mortality, 184 ; abortion, 221. 



Wagogo, restriction of intercourse, 176. 



Wakamba, infanticide, 180. 



Wamakonde, lactation, 174. 



Wanika, infanticide, 180. 



Wanjamuesi, early intercourse, 173 ; 

 lactation, 174 ; restriction of inter- 

 cour.se, 176 ; fertility, 178. 



Wapagoro, early intercourse, 173 ; re- 

 striction of intercourse, 176 ; mar- 

 riage customs, 228. 



War, among hunting and fishing races, 

 149 ; among agricultural races, 169, 

 180, 192 ; among historical races, 

 247 ; Christian Church and, 249 ; 

 over-population and, 304 ; origin of, 

 305 ; selection and, 379. 



Warega, early intercourse, 173 ; restric- 

 tion of intercourse, 175 ; fertility, 

 178 ; abortion, 179 ; infant mor- 

 tality, 184. 



Warri district, restriction of intercourse, 

 175. 



Wazaramo, lactation, 174. 



Wealth, of different areas, 419 ; in- 

 fluence upon tradition, 421 ; shifting 

 of centres of greatest, 423. 



Welle district, war, 181. 



West African tribes, lactation, 174. 



Wheel, invention of, 127. 



Witchcraft, as cause of death, 182. 



Work among primitive races, obligation 

 to, 212. 



Workers' Education Association, 239. 



Woruk, infanticide, 149. 



Writing, invention of, 127. 



Yakuts, lactation, 196 ; property, 211. 



Yguazas, abstention from intercourse, 

 141 ; infanticide, 149 ; war, 152. 



Yoruba-speaking people, lactation, 174 ; 

 restriction of intercourse, 175 ; pro- 

 perty, 209. 



Yuchi, war, 170 ; health, 172. 



Zambala, marriage customs, 227. 

 Zaparos, treatment of aged, 155. 

 Zoroastrianism, marriage and, 253. 

 Zulus, war, 181 ; infant mortalitj% 184 ; 



marriage customs, 227. 

 Zuni, abortion, 169 ; infanticide, 169 ; 



property, 208. 



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