Cover -- Title -- Copyright -- Contents -- Foreword -- Introduction -- On the Old Saw: That May Be Right in Theory But It Won't Work in Practice -- I. On the Relation of Theory to Practice in Morality in General (in reply to some exceptions taken by Professor Garve) -- II. On the Relation of Theory to Practice in Constitutional Law (contra Hobbes) -- III. On the Relation of Theory to Practice in International Law A General-Philanthropic, i.e., Cosmopolitan View (contra Mendelssohn).