Haemophilia, 3 Happiness in marriage, 236 Heredity and responsibility, 195 Heredity of sex, 73 Higher education, 151 ---- in London, 128 ---- and marriage rate, 78 ---- and conservation of energy, 79 Highest education, 154 Identical twins, 55 Illegitimacy, 148, 304, 336, 384 Infant mortality, 70, 172, 177, 194, 259, 325 Infant mortality and alcohol, 370 Insanity, 54, 225 Instinct and emotion, 164 Instinct, Spencer's definition of, 164 Insurance for motherhood, 315 Joy, physiological value of, 112 Kaiser's creed, 11 Knossos, 186 Law of multiplication, 66 Leprosy, 220 Maleness, constitution of, 76 "Man before speech," 39 Marriage age, 196 ---- Metchnikoff on, 199 ---- and quality of children, 204 ---- conditions of, 258 ---- and the "superfluous woman," 259 _et seq._ "Marriage as a Trade," 202 Marriage, social function of, 307 Married women's labour, 306 Mars, the parallel from, 50 Maternal instinct, 163 _et seq._ ---- McDougall on, 168 _et seq._ ---- in the cat, 171, 177 ---- alleged decadence of, 174 _et seq._ Mendelism, 4, 67, 74, 75, 81 _et seq._, 330 Menstrual function, 108 Monogamy and its critics, 272 Monogamy and polygamy, 261 "Morning Post," quotation from, 340 Mortality in childbirth, 217 Mosaic legislation, 147 Mother and child worship, 148 Motherhood, endowment of, 282 ---- physical and psychical, 83 Motherhood insurance, 315 "Mrs. Warren's Profession," 138 Muscles, relative value of, for women, 117 Muscularity and vitality, 99 Natural selection, 32 Nature and nurture, 52, 214 Neanderthal skull, 38 Notification of Births Act, 132 Organic analysis by Mendelism, 81 Parental instinct, 95 Parthenogenesis, 72 Patent medicines and alcohol, 361 _et seq._ Physical fitness for marriage, 208 Physical training of girls, 99 Physiological division of labour, 87 Play centres, 22 Preventive eugenics, 24 Progress and the nervous system, 102 ---- definition of, 37 ---- the two kinds of, 38 Prudery, 130, 132 _et seq._ Psychical fitness for marriage, 211 Puberty, 98, 124 Racial instinct, 167, 180, 225 Racial poisons, 24, 382 Radium, 35 "Reproduction" and "parenthood," 141 Rescue homes, 137 "Richard Feverel," 191 Rights of mothers, 293 _et seq._ ---- of women, 319 Scotland, educational strain at puberty, 115 Separation _versus_ divorce, 293 "Sex and Character," 68 Sex equality and sex identity, 56 _et seq._ Sex and breathing, 93, 94 Sex and the blood, 93 Sex in childhood, 92 Sex antagonism, 391 "Sexual instinct" and "racial instinct," 144 _et seq._ Sexual attraction, Spencer on, 240 _et seq._ Sexual selection, 144 Skipping, 122 Socialism, 182 ---- and motherhood, 282 Socialism and responsibility, 309 Swedish gymnastics, 121 Swimming, 120 Syphilis, 54, 222 _et seq._ Terms of specialization, 87 Transmutation of instinct, 171 ---- of sex, 251 Vacation schools, 22, 114 Variation within a sex, 89 ---- amongst women, 90