f 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