Seri, marriage customs of, 135-136

Sex, origin of, 36, 41-43
---- primary office of, 39-40, 73-74
---- significance of, 75, 99-102, 114

Sex-elements, early separation of, 76

Sex-hatred, evils of, 24, 67, 266-267, 268-269, 288-289, 291, 326-327,
380-381

Sex-hunger, 75, 99

Sex-relationships assume different forms to suit varying conditions of
life, 103, 107, 111-113

Sex-victims, 55

Sexes, early position of, 55, 73 _et seq._, 249-250

Sexual abstinence. _See_ Chastity
---- antipathy, 215, 265, 266-267
---- attraction, 215, 266
---- crimes, 34, 65, 87, 112, 347
---- instincts, imperious action of, 33-34, 59, 67, 73, 75, 88 _et
seq._, 99, 101, 254, 261, 319, 326, 372
---- reproduction. _See_ Reproduction
---- selection, 75, 100 _et seq._, 104 _et seq._, 114, 250, 254, 262

Shaw, G.B., on woman's right of selection in love, 65-66, 253
---- on economic factor in prostitution, 362-363

Simcox on the Egyptians, 193 (_note_), 195, 202

Slugs, love of, 77

Snails, love organ of, 77

Socrates on love, 223

Spain, position of women in, 286-287

Sparta. _See_ Greece

Spermatozoon, 36, 49, 53, 251

Spider, courtship of the, 64 _et seq._

Spores, 36

Stickleback, habits of, 80
---- paternal care of offspring among, 80

Sterility, sin of, 378-379

Structural modifications to adapt the sexes to different modes of life, 107

Suffrage, struggle for, 9, 379-380, 382-383

Superiority of the female, 56-58, 66-68, 73, 90, 103, 124, 125, 249,
267, 383-384

Superiority of the male, 10, 12-13, 23-24, 47-48, 104, 249

Surinam toad, 81

T

Tadpoles, 43, 77

Talent, sexual differences in, 292 _et seq._

Thargalia, 223

Theodota, 223

Thibet, polyandry in, 150

Third-sex, 269-270

Thomas on the sexual differences, 274, 304

Thomson, J.A., on the difference of variability in men and women, 298-299

Thucydides on the duty of women, 223

Todas tribe, 149

Transition, present period of, for women, 11, 263-264, 267, 280-281,
288, 289-290, 314-317, 325, 333, 379, 381, 384

Tyrant bird, love calls of, 96

U

Ulpian, the jurist, on a double standard of morality for the sexes, 240

Union, free. _See_ Free-love

Use of male to female, 40, 44, 103, 250, 309, 384

V

Variation in the two sexes, 297-300

Variety. _See_ Need for Sexual Variety

Virgin birth, stories of, 126, 202, 228 (_note_)

Virginity, 171, 189, 344

Visions, sexual, 320-321, 323

_Volvox_, 41-4