The greatest minds in Germany have dealt with this problem, and given to its solution the exactness of science. No greater have been applied to any question. Foremost in this list, in time and in fame, is Leibnitz, that marvel of human intelligence, second, perhaps, to none in history, who, on reading the "Project of Perpetual Peace" by the Abbe de Saint-Pierre, pronounced this judgment: "I have read it with attention, and am persuaded that such a project is on the whole feasible, and that its execution would be one of the most useful things in the world." [Footnote: Observations sur le Projet d'une Paix Perpetuelle de M. l'Abbe de Saint-Pierre: Opera, ed. Dutens, (Genevae, 1768,) Tom. V. p. 56.] Thus did Leibnitz affirm its feasibility and its immense usefulness. Other minds followed, in no apparent concert, but in unison. I may be pardoned, if, without being too bibliographical, I name some of these witnesses. At Goettingen, renowned for its University, the question was opened, at the close of the Seven Years' War in 1763, in a work by Totze, whose character appears in its title, "Permanent and Universal Peace in Europe, according to the Plan of Henry IV." [Footnote: Der ewige und allgemeine Friede in Europa, nach dem Entwurf Heinrichs IV.] At Leipsic, also the seat of a University, the subject was presented in 1767 by Lilienfeld, in a treatise of much completeness, under the name of "New Constitution for States," [Footnote: 2 Neues Staatsgebaeude.] where, after exposing the wretched chances of the battlefield and the expense of armaments in time of peace, the author urges submission to Arbitrators, unless a Supreme Tribunal is established to administer International Law and to judge between nations. In 1804 appeared another work, of singular clearness and force, by Karl Schwab, entitled "Of Unavoidable Injustice," [Footnote: Ueber das unvermeidliche Unrecht.] where the author describes what he calls the Universal State, in which nations will be to each other as citizens in the Municipal State. He is not so visionary as to imagine that justice will always be inviolate between nations in the Universal State, for it is not always so between citizens in the Municipal State; but he confidently looks to the establishment between nations of the rules which now subsist between citizens, whose differences are settled peaceably by judicial tribunals.