One road lies through the development of what is known as International, but should more properly be called _Inter-State Law_, through the revival, on a firmer and broader foundation, of the Concert of Europe conceived by the Congress of Vienna just a hundred years ago—itself a revival, on a secular basis, of the great medieval ideal of an international Christendom, held together by Christian Law and Christian ideals. That ideal faded away forever at the Reformation, which grouped Europe into independent sovereign States ruled by men responsible to no one outside their own borders. It will never be revived on an ecclesiastical basis. Can we hope for its revival on a basis of modern democracy, modern nationality, and modern educated public opinion? Can Inter-State Law, hitherto a mere shadow of the majestic name it bears, almost a matter of convention and etiquette, with no permanent tribunal to interpret it, and no government to enforce it, be enthroned with the necessary powers to maintain justice between the peoples and governments of the world? Such a Law the statesmen of Great Britain and Russia sought to impose on Europe in 1815, to maintain a state of affairs which history has shown to have been intolerable to the European peoples. There are those who hope that the task can be resumed, on a better basis, at the next Congress. “Shall we try again,” writes Professor Gilbert Murray, “to achieve Castlereagh’s and Alexander’s ideal of a permanent Concert, pledged to make collective war upon the peace-breaker? Surely we must. We must, at all cost and in spite of all difficulties, because the alternative means such unspeakable failure. We must learn to agree, we civilized nations of Europe, or else we must perish. I believe that the chief counsel of wisdom here is to be sure to go far enough. We need a permanent Concert, perhaps a permanent Common Council, in which every awkward problem can be dealt with before it has time to grow dangerous, and in which outvoted minorities must accustom themselves to giving way.” [Sidenote: Peace will be based on Law.]