• Wallace, A. R., 24, 27.
• Wallaschek, 34, 57.
• Waller, E., 16.
• Walsingham, 135.
• Weismann, 31.
• Weissenberg, 99.
• Wesché, W., 19.
• Wessmann, Rev. R., 273.
• Westermarck, 52, 73, 74, 234, 265.
• Wiedemann, 113.
• Weysse, 127.
• Williams, Montagu, 80.
• Williams, W. Roger, 243.
• Winckel, 203.
• Windscheid, 195.
• Wittenberg, 200.
• Wolbarst, 224.
• Wollstonecraft, Mary, 276.

• Yellowlees, 243.

• Zacchia, 199.
• Zambaco, 9.
• Ziegler, H. E., 31.
• Ziehen, 203.
• Zmigrodski, 54.

INDEX OF SUBJECTS.

• Abduction of women in Great Britain, 72.
• Abstinence in women,
  • effects of sexual, 230.
• Adolescence,
  • criminality and, 70.
• Adolescent girls,
  • sexual manifestations in, 209 et seq.
• Adrenal glands, 16.
• Africa,
  • marriage by capture in, 76.
  • sexual instinct in, 27.
• Agelena labyrinthica, 36.
• Ainu,
  • love-bite among, 87.
• Algolagnia, 119.
  • ideal, 166.
• Algophily, 119.
• Amblyopia,
  • post-marital, 248.
• American Indians,
  • courtship among, 48, 80.
  • sexual instinct in, 268.
• Ampallang, 98.
• Anæsthesia in women,
  • sexual, 203 et seq.
  • a cause of sterility, 212.
  • causes of, 207 et seq.
• Anger and sexual emotion, 138, 172 et seq.
• Anhedonia, 203.
• Anxiety as a sexual stimulant, 179.
• Ardisson, 126.
• Argus pheasant, courtship of, 40.
• Aristotle as a masochist, 111.
• Arrest of movement producing sexual excitement, 168.
• Ascetic attitude toward women, the, 192.
• Assaults on children by women,
  • sexual, 225.
• Australians,
  • courtship among, 41, 75.
  • sexual instinct in, 262.
• Auto-intoxication by muscular movement, 53.
• Auto-sadism, 127.

• Bambula dance, 49.
• Bathory, Countess, 124.
• Bedouins,
  • marriage by capture among, 77.
• Bertrand, Sergeant, 182.
• Birds,
  • sexual impulse in, 30, 233, 246.
• Bismarck,
  • traces of masochism in, 112.
• Biting in relationship to sexual instinct, 84 et seq., 120.
• Bladder and sexual organs,
  • relationship between, 59 et seq.
• Blood,
  • the fascination of, 121 et seq.
• Borneo,
  • use of ampallang in, 98.
• Brazil,
  • courtship in, 47.
• Bullying, 173.

• Capture,
  • marriage by, 71 et seq.
• Castration, 7 et seq., 237.
• Cerebellum as a sexual center, 15.
• Cerebral sexual centers,
  • alleged, 15.
• Chained,
  • the idea of being, 156.
• Chastity among savages, 260, 266.
• China,
  • marriage ceremony in, 77.
• Chinese eunuchs, 9.
• Chinese hedgehog, 99.
• Christianity and women, 192, 197.
• Church and flagellation, the, 129, 130.
• Coitus,
  • mechanism of, 235.
  • compared to epilepsy, 63.
  • often sacred among savages, 261.
• Combat and courtship, 28, 67, 172.
• Contrectation, 21.
• Courtship, 22 et seq., 33, 34 et seq., 66 et seq.,
  • 172 et seq., 229, 239.
• Cow-birds,
  • courtship of, 39.
• Crime as a manifestation of adolescence, 70.
• Criminality in relation to marriage, 190.
• Cruelty among animals, 67.
  • in human beings, 68 et seq., 83, 109, 171, 185.
• Cymri,
  • marriage customs of, 133.

• Dancing in relation to sexual impulse, 29, 41 et seq. 53, 56.
  • among Australians, 41.
  • the most usual method of attaining tumescence, 53.
  • why it acts so powerfully on the organism, 54.
• Day-dreams, erotic, 143, 145, 146.
• Degenerative conditions on sexual desire,
  • influence of, 175.
• Dendryphantes elegans, 36.
• Detumescence,
  • impulse of, 21, 59, 63, 65.
• Diffusion of sexual impulse in women, 249 et seq.
• Discipline, the, 129.
• Disgust as a sexual stimulant, 178.
• Divorce in relation to sexual difference in the suicide-rate, 189.
• Doraphobia, 115.
• Dreams of struggling horses, 169.
  • erotic, 241.
• Drunkenness in relation to marriage, 191.
• Ducks,
  • courtship among, 10.
• Ductless glands, 16.

• Eider-ducks,
  • courtship of, 233.
• Ejaculation,
  • premature, 232.
• Emotion aroused by pain, 172, 186.
• Ephesian matron, the, 181.
• Epilepsy and micturition, 59, 61.
  • analogy between coitus, 63.
• Erotic symbolism, 188.
• Erotisation, 8.
• Eskimos,
  • marriage by capture among, 75.
  • sexual instinct in, 268.
• Esthetic sense of animals,
  • alleged, 266.
• Estrus, 25.
• Eunuchs,
  • sexual impulse in, 9.
• Evacuation theory of sexual impulse, 3 et seq., 17, 58.
• Excess in intercourse not injurious to women, 247 et seq.
• Exercise, the intoxication of muscular, 53.
• Exhibitionism, a cause of, 223.

• Faroe Islanders,
  • courtship among.
• Fatigue, 182, 187.
• Fear as a sexual stimulant, 138, 172 et seq.
• Fetichism, 156, 157.
• Fetters,
  • the fascination of, 156.
• Flagellation, 129 et seq.
• Frigidity,
  • in women, sexual, 203 et seq.
  • a cause of sterility, 212, 239.
• Frog,
  • sexual instinct of, 4, 7.
• Fuegians,
  • sexual instinct in, 268.
• Funerals as a sexual stimulant, 180.
• Fur,
  • fascination of, 115, 116.

• Gelding,
  • sexual impulse in, 8.
• Genital sphere larger in women, 249.
• Geskel, 99.
• Glandulæ vesiculares, 6.
• Goethe's masochism, 112.
• Gonorrhœa in young boys, 224.
• Greek antiquity, love in, 196.
• Grief as a sexual stimulant, 180.
• Griselda, 102.
• Gurus,
  • courtship among, 50.

• Hanging and sexual excitement, 152.
• Head hunting, 68.
• Helix aspersa, 35.
• Hemothymia, 121.
• Hormones, 16.
• Horror feminæ normal in absence of sexual impulse, 265.
• Horses,
  • sexual perversion in, 137.
  • sexual excitement produced by spectacle of, 169.
• Hungary,
  • masochism in, 79.
• Hunger,
  • analogy between sexual impulse and, 64.
• Hyperhedonia, 203.
• Hyphedonia, 203.
• Hypnotic suggestions and frigidity, 240.

• Impregnation in relation to tumescence, 212, 239.
• Impulse,
  • definition of sexual, 2.
• India,
  • courtship in, 46, 77.
  • sexual instinct in, 273.
• Indians,
  • courtship among American, 48, 80.
  • sexual instinct among American, 268.
• Indonesian peoples,
  • use of ampallang, etc., among, 97 et seq.
• Insanity,
  • in relation to marriage, 190.
  • in relation to sexual instinct, 214, 251, 255.
• Instinct,
  • definition of, 1 et seq.
• Internal secretions, 16.
• Intoxication,
  • the fascination of, 54, 185.
  • of muscular movement, 53.
• Inversion,
  • associated with masochism, 149.

• Jealousy among savages, 265.
• Jew,
  • sexual impulse in, 238.

• Kaffirs,
  • courtship among, 48.
• Kambion, 98.
• Kirghiz,
  • marriage by capture among, 71.
• Kiss,
  • origin of, 86.

• Lactation,
  • no intercourse among some savages during, 268 et seq.
• Laughter and the sexual sphere, 62.
• Leistes superciliaris, 39.
• Love-bite, the, 84, 120.
• Love-songs rare among savages, 265.
• Lycanthropy, 125.

• Malays,
  • coitus among, 99, 237, 270.
  • courtship among, 44, 71, 76.
  • sexual instinct in, 270.
• Mantis religiosa, 37.
• Maoris,
  • marriage by capture among, 75.
  • sexual instinct in, 269.
• Marquesans,
  • courtship among, 46.
  • sexual instinct in, 269.
• Marriage by capture, 71 et seq.
  • in relation to suicide, 189.
  • in relation to insanity and criminality, 190.
• Marsh-bird,
  • courtship of, 39.
• Masochism among Slav women, 79.
  • definition of, 111 et seq., 120, 132.
  • its psychological mechanism, 101 et seq., 149, 159.
• Masturbation in women, 241, 243, 249.
• Menopause, sexual impulse after, 13.
• Menstruation and sexual impulse, 214, 215.
• Micturition and sexual impulse, 59 et seq.
• Mixoscopia,
  • hysterical, 177.
• Modesty among savages, 259.
  • object of, 29, 33, 68, 73.
  • obsessions of, 60.
• Molothrus bonariensis, 39.
• Moluccas,
  • courtship in, 45.
• Monogamy,
  • its advantages for men, 189.
• Mortality connected with the development of the sexual instinct, 276.
• Moslems,
  • coitus among, 274.
• Moths,
  • courtship of, 38.
• Motion,
  • the pleasure of, 54, 58.
  • arrest of, 168.
• Muscular movement,
  • auto-intoxication by, 53.
• Music,
  • sexual influence of, 29.

• Necrophilism, 126, 182.
• Necrosadism, 126.
• Negresses not jealous, 266.
• Negro eunuchs, 9.
• Negroes,
  • sexual instinct in, 238, 271.
• Neurasthenia, sexual, 232.
• New Caledonia,
  • courtship in, 75.
• New Guinea,
  • courtship in, 43.
• New Hebrides,
  • courtship in, 45.
• New Mexico,
  • courtship in, 47.
• New Zealand,
  • marriage by capture in, 75.
• Nubia,
  • eunuchs in, 10.

• Obsessions,
  • sexual, 60.
• Octopus,
  • courtship of, 35.
• Odour,
  • excitation by, 183.
• Oneida community, 237.
• Oöphorectomy and sexual impulse, 13, 204.
• Orgasm lasts longer in women, 236.
• Ostrich,
  • courtship of, 41.
• Ovariotomy and sexual impulse, 13, 204.
• Ovary,
  • secretions of, 16.
• Ox,
  • sexual impulse in, 8.

• Pain the essential element in algolagnia, 159, 172.
• Palang, 98.
• Papuans,
  • courtship among, 43.
  • sexual instinct in, 269.
• Parturition sometimes painless, 96.
• Passivism, 111.
• Passivity of women only apparent, 229 et seq.
• Penis in lower animals,
  • peculiarities of, 100.
• Periodicity of sexual impulse among savages, 275.
  • greater in women, 223, 254.
• Pitangus Bolivianus, 39.
• Pleasure,
  • in what sense pain may be felt as, 90 et seq.
  • its manifestations resemble those of pain, 84.
• Plover,
  • dances of great, 30.
• Power in sexual sphere,
  • love of, 78 et seq.
• Precocity of women,
  • sexual, 243.
• Pregnancy,
  • savages often avoid intercourse during, 268 et seq.
• Probenächte, 78.
• Procreation among savages,
  • sacredness of, 261.
• Pro-estrum, 25.
• Prostitutes' love of souteneur, 80.
• Prostitution not found under primitive conditions, 260, 269.
• Puberty in girls,
  • sexual manifestations at, 209 et seq.

• Rais, Gilles de, 125.
• Rana temporaria, 5.
• Rape and sadism, 126.
• Rat,
  • sexual instinct of white, 5, 6, 233.
• Reeves and ruffs, 28.
• Reflex action,
  • instinct and, 2.
• Reidal, 126.
• Religious flagellation, 130.
• Religious storm and stress in women, 250.
• Reproductive impulse,
  • alleged, 19.
• Respiration in connection with sexual emotion, 153 et seq.
• Responsibility of Sadists, 127.
• Rome,
  • eunuchs in ancient, 9.
• Rosseau's masochism, 113, 146, 207.
• Russia,
  • masochism in, 79.

• Sacher-Masoch, 114 et seq.
• Sacredness of procreation among savages, 261.
• Sade, De, 106 et seq., 159.
• Sadism, 69, 132, 148.
  • definition of, 105 et seq., 120.
  • its psychological mechanism, 160 et seq.
  • responsibility in, 127.
  • often combined with masochism, 159.
  • ideal, 165.
• Saitis pulex, 35.
• Savages,
  • sexual erethism in, 52, 259 et seq.
  • dancing among, 53.
  • sexual impulse weak in, 52, 261 et seq.
• Sea-gulls,
  • courtship among, 246.
• Secondary sexual characters, 7.
• Seminal receptacles of frogs, 5.
• Seminal vesicles, 5.
  • functions of, 6.
• Senegal,
  • courtship in, 49.
• Sensibility of genital sphere in women, 95 et seq., 236.
• Sensory acuteness in women, 203 et seq.
• Sexual cerebral centers,
  • hypothetical, 15.
• Sexual impulse,
  • definition of, 2, 65.
• Sexual incompetence,
  • prevalence of, 232.
• Sexual selection,
  • psychological aspects of, 22 et seq.
• Sexual season, 25.
• Shaftesbury's supposed masochism, 112.
• Shoe-fetichism, 157.
• Sicily, courtship in, 51.
  • love-bite in, 87.
• Slavery, erotic, 111.
• Slavs,
  • courtship customs of, 78.
  • masochism among, 79.
• Slug,
  • courtship of, 34.
• Smell,
  • stimulation of, 183.
• Snails,
  • sexual process in, 28, 34.
• Social class and sexual feeling, 207.
• Soleilland, 126.
• Song of birds,
  • sexual significance of, 29.
• Spadones, 9.
• Spain,
  • flagellation in, 135.
• Spiders,
  • courtship of, 35.
• Sprit-sail yard, 98.
• Stabbers, 124.
• Sterility,
  • absence of sexual desire in women as a cause of, 212, 239.
• Stone-curlew,
  • dances of, 30.
• Storm and stress in women,
  • religious, 250.
• Strangle,
  • the impulse to, 151 et seq.
• Subjection in women,
  • sexual, 78 et seq., 102.
• Suckling,
  • compared to sexual act, 18.
  • no intercourse among some savages during, 268 et seq.
• Suicide,
  • divorce and, 189.
• Sumatra,
  • courtship in, 44, 99.
• Suspension and sexual excitement, 154.
• Swinging and sexual excitement, 154.
• Symbolism,
  • erotic, 188.

• Taboo,
  • sexual, 263.
• Tahitians,
  • courtship among, 46.
• Teasing, 173.
• Telum veneris, 34.
• Thlasiæ, 9.
• Thlibiæ, 9.
• Torture,
  • the attraction of, 156, 164.
• Tumescence, 25, 34 et seq., 53, 57, 65.
• Turcomans,
  • marriage by capture among, 74.
• Tyrant-bird,
  • courtship of, 39.

• Urination in relation to sexual excitement, 59 et seq.

• Vacher, 126.
• Vampirism, 126.
• Variation in sexual impulse greater in women, 254.
• Venereal disease in the young, 224.
• Vesicles,
  • function of seminal, 6.

• Waltz,
  • origin of the, 57.
• Warens, Mme. de, 206.
• Werwolf, 125.
• Whipping in relation to the sexual emotions, 115, 129 et seq.
• Women-stabbers, 124.
• Wrestling combats, 70.

• Zoösadism, 126.
• Zulus,
  • courtship among, 49.