The New Movement for giving Sexual Instruction to Children--The Need of such a Movement--Contradictions involved by the Ancient Policy of Silence--Errors of the New Policy--The Need of Teaching the Teacher--The Need of Training the Parents--And of Scientifically equipping the Physician--Sexual Hygiene and Society--The far-reaching Effects of Sexual Hygiene 244 IX.--IMMORALITY AND THE LAW Social Hygiene and Legal Compulsion--The Binding Force of Custom among Savages--The Dissolving Influence of Civilization--The Distinction between Immorality and Criminality--Adultery as a Crime--The Tests of Criminality--National Differences in laying down the Boundary between Criminal and Immoral Acts--France--Germany--England--The United States--Police Administration--Police Methods in the United States--National Differences in the Regulation of the Trade in Alcohol--Prohibition in the United States--Origin of the American Method of Dealing with Immorality--Russia--Historical Fluctuations in Methods of Dealing with Immorality and Prostitution--Homosexuality--Holland--The Age of Consent--Moral Legislation in England--In the United States--The Raines Law--America Attempts to Suppress Prostitution--Their Futility--German Methods of Regulating Prostitution--The Sound Method of Approaching Immorality--Training in Sexual Hygiene--Education in Personal and Social Responsibility 258 X.--THE WAR AGAINST WAR Why the Problem of War is specially urgent To-day--The Beneficial Effects of War in Barbarous Ages--Civilization renders the Ultimate Disappearance of War Inevitable--The Introduction of Law in disputes between Individuals involves the Introduction of Law in disputes between Nations--But there must be Force behind Law--Henry IV's Attempt to Confederate Europe--Every International Tribunal of Arbitration must be able to Enforce its decisions--The Influences making for the Abolition of Warfare--(1) Growth of International Opinion--(2) International Financial Development--(3) The Decreasing Pressure of Population--(4) The Natural Exhaustion of the Warlike Spirit--(5) The Spread of Anti-military Doctrines--(6) The Over-growth of Armaments--(7) The Dominance of Social Reform--War Incompatible with an Advanced Civilization--Nations as Trustees for Humanity--The Impossibility of Disarmament--The Necessity of Force to ensure Peace--The Federated State of the Future--The Decay of War still leaves the Possibilities of Daring and Heroism 311 XI.--THE PROBLEM OF AN INTERNATIONAL LANGUAGE