Home and one family, 165-186 Home life threatened, 49, 174, 176 _et seq._, 185, 241 _et seq._, 244-247 Houtzeau, J. C., 127 Howard, Eliot, 107 Hudson, W. H., 107 Hygiene, Sexual. (_See_ Sexual education.) Hypocrisy, 231 _et seq._, 236, 238, 257, 346 I Ideal of the home, 170, 196, 243-244 Ideal of marriage, 248-249, 300 Ideals, The guide to conduct, 52, 166, 170, 203, 204-205, 210, 216, 300, 342, 344, 354, 372 Ignorance, Evils of, 40 Illegitimacy, Causes of, 268-270 Illegitimacy, Its connection with marriage, 267-268 Illegitimacy, Problem of, 257-282 Illegitimacy, Sin of, 259, 261, 274 Illegitimate birth the result of unhappy marriages, 268 Illegitimate child, Appointment of guardians for, 279, 280 Illegitimate child, Protection of, 259, 261, 265, 270-282 Illegitimate infantile death-rate, 261-264 Incubation of eggs, 63, 103 Independence of woman. (_See_ Freedom and woman.) Indifference to offspring among pre-human parents, 63, 87, 100, 121 Individual family, 145, 155 _et seq._, 159, 170, 181, 185, 195, 245 Individualism, 204, 352, 372 Industrialism, 40 _et seq._, 50, 52, 170, 171, 174, 177, 182, 244, 352, 356 Industrial values, 352, 372 Infanticide, 128, 267, 279 Infantile death-rate. (_See_ Death-rate, Infantile.) Infantile sexuality, 315-316, 340 Insect home-makers, 64-66, 67, 68, 70, 74 Insect parenthood, 59-76 Instinct, Action of, 21, 37, 61, 64, 70, 75-76, 199-216, 341, 356 Instincts, Atrophy of, 356 _et seq._ Instincts, Primitive, 199 Instincts, Regeneration of, 201, 298-300, 376, 377 Instruction of girls among primitive peoples, 152, 344 Instruction in sex more necessary for girls than boys, 329-339 Intellectual reformers, 166-168, 196, 197, 330 Intelligence, Connection between caring for young, 75-76, 95, 99, 131, 132, 135 Iroquois Indians, 180 J Jealousy, 109, 121 _et seq._, 143-146, 150 _et seq._, 202-203 K Key, Ellen, 272 Kinship, Feeling of, 144. (_See also_ Mother, The, in one primitive family.) L Laws, Need of, to protect illegitimate child, 279-282. (_See also_ Mother, The unmarried.) Lessons to be learnt from past history of one family, 142-143, 165 _et seq._, 191 _et seq._ Lessons to be learnt from pre-human parents, 60 _et seq._, 76, 82-83, 93-96, 99-102, 112, 114, 130-135, 165, 181 Letourneau, 125, 126, 128 Letters from working women. (_See_ Women’s Co-operative Guild.) Levick, Murray, 110 Libertinage. (_See_ Profligacy.) Life, Externalising of, 17 _et seq._, 351 _et seq._ Life, Meaning of, 135, 159, 197-198, 375-376 Love, 190, 198-200, 201, 211, 214-215, 326, 347, 376-377 Love, Art of, 298 Love-child. (_See_ Illegitimacy.) Love, Free, 197, 202, 211. (_See also_ Sexual relationships, Irregular.) Love triumphant, 376-377 Love, Wild, 239, 251