Fertility in Women 363 The Restriction of Fertility and the Use of Means for the Prevention of Pregnancy 388 The Determination of Sex 420 I. Statistical Investigations 422 II. Anatomical Investigations 446 III. Experimental Investigations 452 Sterility in Women 462 Incapacity for Ovulation 470 Interference with Conjugation, Conditions Preventing Access of the Spermatozoa to the Ovum 487 Diseases of the Ovaries and the Fallopian Tubes 489 Diseases of the Uterus 494 Pathological Changes in the Cervix Uteri 501 Displacements of the Uterus 515 Myoma of the Uterus 523 Diseases of the Vagina and the Vulva 526 Secretions of the Genital Organs 528 A. Absolute 540 B. Relative Sterility 540 Sexual Sensibility in Women 542 Incapacity for Incubation of the Ovum 549 Only-Child-Sterility 561 Operative Sterility 563 Table Showing the Causes of Sterility in Women 569 III. THE SEXUAL EPOCH OF THE MENOPAUSE 571 The Menopause 571 Changes in the Female Reproductive Organs at the Menopause 583 The Time of the Menopause 593 The Age at which the Menopause occurs 593 1. Race 594 2. The Age at which the Menarche Occurred 595 3. The Woman’s Sexual Activity 597 4. The Social Circumstances of the Woman’s Life 599 5. General Constitutional and Pathological Conditions 599 6. Premature, Delayed, and Sudden Onset of the Menopause 600