Part 1 provides a comprehensive analysis of Socialism: the economic, the ethical and the political Conceptions; the industrial and the distributive proposal; is Socialism scientific? a definition of Socialism. Part 2 is about Economics; Value, origin and nature of Capital, Land and Rent, Wages of Labour and Competition. Part 3 covers Ethics: Natural Rights; Happiness or Justice; the Right to the use of the Earth; the ethics of Property; Individualism. Part 4 describes the outcome of Socialism: the unconscious growth of Social Functions; the industrial organisation of the Socialist State; the political, the industrial, and the ethical outcome of Socialism; the family under Socialism. Part 5 provides the solution - the Single Tax: objections to Principles; the method of Reform; the ethics of Compensation; the efficiency of the Reform.