INDEX 



513 



Lactation, influence upon fecundity, 

 102 ; among hunting and fishing 

 races, 137 ; among agricultural races, 

 165, 174, 185, 196 ; among historical 

 races, 254. 



Land, claims of groups to areas of, 203 ; 

 property in, 279. 



Language, tradition and, 408, 412. 



Laws, encouraging population, 22. 



Lenda district, infanticide, 180. 



Lenguas, lactation, 165 ; infanticide, 

 169, 220. 



Liberia, lactation, 174 ; fertility, 177. 



Lillooets, age at marriage, 140, 226 ; 

 war, 151 ; division of food, 212. 



Limitation of families, views of Mill, 

 202. 



Limitation of the surface of the world, 

 theories of population and, 20 ; influ- 

 ence upon evolution, 59. 



Lind hinterland, 180. 



Loango, restriction of intercourse, 176. 



Loucheux, food, 233. 



Macusis, fertility, 168. 



Madagascar, fertility, 178 ; abortion, 

 179 ; witchcraft, 182. 



Madi district, lactation, 174. 



Magdalenian period, 123. 



Makalaka, fertility, 178. 



Makonde, early intercourse, 173. 



Malaria, 349. 



Malays, 163. 



Maldive Islands, marriage customs, 226. 



Malemutes, infanticide, 148 ; war, 151. 



Malthusian theory, anticipations of, 19, 

 25 ; nature of, 28 ; reception of, 29 ; 

 debt of Darwin and Wallace to, 34 ; 

 summary of, 197 ; criticism of, 199. 



Mandans, fertility, 167 ; health, 172 ; 

 food, 234. 



Mandingoes, fertility, 177. 



Mandja, restriction of intercourse, 175 ; 

 infanticide, 180 ; food, 234. 



Mandrucos, war, 171 ; health, 236. 



Mangbetu, early intercourse, 173 ; lacta- 

 tion, 174 ; fertility, 178 ; abortion, 

 179 ; infant mortality, 184 ; pro- 

 perty, 209. 



Manu, Laws of, 253. 



Marquesas, fertility, 187 ; infanticide, 

 191. 



Marriage, among animals, 62 ; influ- 

 ence of age at, 103 ; among primitive 

 races, 139 ; postponement of, among 

 hunting and fishing races, 139, 226 ; 

 disparity in age at, 140 ; postpone- 

 ment of, among agricultural races, 

 165, 174, 185, 196 ; customs regard- 

 ing, 224, 275 ; postponement of, 

 among historical races, 251, 264, 279, 

 306 ; prohibition of, 281, 282. 



Marshall Islands, war, 193. 



Masai, early intercourse, 173 ; war, 



181 ; marriage customs, 228. 

 Mayombe, lactation, 174 ; restriction 



of intercourse, 175. 



Mbayas, infanticide, 169 ; health, 236. 

 Memory among animals, 50. 

 Mendelian inheritance, nature of, 71 ; 



in man, 356. 



Menstruation, relation to ovulation, 90. 

 Mental evolution, among animals, 45 ; 



connexion with reproduction, 51 ; 



among men, 50 ; influence upon 



population problem, 80. 

 Mercantile theory of trade, 22. 

 Mexico, lactation, 165 ; restriction of 



intercourse, 166 ; abortion, 169 ; 



war, 170 ; property, 208 ; age at 



marriage, 220. 

 Migration, over-population and, 297 ; 



selection and, 381. 

 Minnetanes, war, 170. 

 Minoan civilization, 244. 

 Miri district, restriction of intercourse, 



176. 



Mitchell Islands, abortion, 190." 

 Mittelschmerz, 94. 

 Modifications, nature of, 68. 

 Mohammedanism, celibacy, 253 ; lacta- 

 tion, 254. 



Mohaves, infanticide, 169. 

 Moioa, restriction of intercourse, 175. 

 Monasticism, celibacy and, 279. 

 Mongols, marriage, 253. 

 Montagnais, health, 233. 

 Mousterian period, 121. 

 Moxos, restriction of intercourse, 166 ; 



fertility, 168. 



Mundas, marriage customs, 275. 

 Murray Islands, war, 192 ; infanticide, 



220. 



Mutations, nature of, 68 ; origin of, 73 ; 

 among men, 81, 383. 



Nagas, war, 248. 



Nahuas, contraceptive methods, 167 ; 

 abortion, 168. 



Nandi, early intercourse, 173 ; lacta- 

 tion, 174 ; restriction of intercourse, 

 176. 



Nandowensis, marriage customs, 229. 



Natchez, marriage customs, 229 ; 

 health, 236. 



Natural Selection, among species in 

 nature, 75 ; lethal and reproductive, 

 367 ; strength of, 369 ; in inter- 

 mediate period, 370 ; in first and 

 second periods, 371 ; of tradition, 

 417. 



Navahos, early intercourse, 164 ; con- 

 traceptive methods, 167 ; abortion, 

 168; infanticide, 169 ; property, 208. 



Neanderthal man, 116. 



Neolithic period 118, 123. 



