Decision of Physician Regarding Marriage of Patients Infected with Gonorrhea or Syphilis--Advisability of Certificate of Freedom from Transmissible Disease--Premarital Examination as a Universal Custom--When a Man Who Had Gonorrhea May Be Allowed to Marry--When a Woman Who Had Gonorrhea May be Allowed to Marry--Antisepsis Before Coitus--Question of Sterility in the Man Who Has Had Gonorrhea Easily Answered--Impossibility of Determining Whether the Woman is Fertile or Not. XXX. MARRIAGE AND SYPHILIS 195 Rules for Permitting a Syphilitic Patient to Marry--Rules More Severe in Cases Where Children Are Desired--Where Both Partners Are Syphilitic--Danger of Paresis in Some Syphilitic Patients--A Case in the Author's Practice. XXXI. WHO MAY AND WHO MAY NOT MARRY 200 The Physician Often Consulted as to Advisability of Marriage-- _Venereal Disease_ the Most Common Question--_Tuberculosis_-- Sexual Appetite of Tubercular Patients--Effect of Pregnancy Contraceptive Knowledge for Tubercular Wife--_Heart Disease_-- Serious Bar to Marriage--Influence of Sexual Intercourse-- _Cancer_--Fear of Hereditary Transmission--_Exophthalmic Goiter_--Most Frequent in Women--Simple Goiter--Exceptions to Rule--_Obesity_--Family History--Obesity and Stoutness Not Synonymous--_Arteriosclerosis_--Danger in Sexual Act--_Gout_-- Real Causes of Gout--_Mumps_--Parotid Glands and Sex Organs-- Mumps and Sterility--Ooephoritis Due to Mumps--_Hemophilia_-- Hemophilic Sons May Marry--Hemophilic Daughters May Not Marry--_Anemia_--_Chlorosis_--_Epilepsy_--Hysteria--Symptoms of Hysteria--Marriage of Hysterical Women--_Alcoholism_-- Effect on Offspring--Alcoholics and Impotence-- _Feeblemindedness_--Evil Effects on Offspring--Sterilization of Feebleminded Only Preventive--_Insanity_--Functional Insanity--Organic Insanity--Hereditary Transmissibility of Insanity--Fear Resulting in Insanity--Environment versus Heredity in Insanity--_Neurosis_--_Neurasthenia_-- _Psychasthenia_--_Neuropathy_--_Psychopathy_--Nervous Conditions and Genius--Sexual Impotence and Genius--_Drug Addiction_--External Causes--_Consanguineous Marriages_--When Consanguineous Marriages are Advisable--Offspring of Consanguineous Marriages--Homosexuality--Homosexuals Often Ignorant of Their Condition--Sexual Repression and Homosexuality--Sadism and Divorce--Masochism--Sexual Impotence and Marriage--Effect Upon the Wife--Frigidity--Marital Relations and Frigid Woman--Excessive Libido and Marriage--Excessive Demands Upon Wife--Satyriasis--The Excessively Libidinous Wife--Nymphomania--Treatment--Harelip--Myopia--Astigmatism-- Premature Baldness--Criminality--Crime as Result of Environment--Legal and Moral Crime--Ancestral Criminality and