We are coming to believe that the most significant fact about man and his civilization is their improvability. Individual inventive genius has added improvement after improvement until it would seem that man's mastery over nature is to be well-nigh complete as these ideas and inventions are socialized and extended to benefit all. We are now entering the era of social achievement when mankind unitedly undertakes by organization and coöperation mightier tasks than ever accomplished before. Many dreadful diseases are disappearing before preventive medicine, and sanitary science is eliminating many plagues; pestilence is coming to be a thing of the past. Human welfare is now the concern of coöperative mankind, and social science will condemn and banish war or fail to establish itself as an applied science. It _can_ be done! It _ought_ to be done! It _will_ be done! And although this consummation seems to many far away, it may be accomplished by very simple methods. It only waits the time of concerted action on the part of the leading nations when the principles of arbitration can be invoked more fully, and a world-court established with plenary powers for settling all disputes between the nations. International legislation has occurred repeatedly, though no world-court has as yet been established. In the case of the Universal Postal Union we have what is tantamount to world-legislation, in that all civilized nations have entered into a formal agreement regarding the delivery of mail. Another instance of practical world-legislation is that of the International Bureau of Weights and Measures. Many other examples might be given in which several nations are parties to an agreement regarding some important measure, such as the respect paid to the flag of truce, the regulations concerning commerce on the high seas, and the etiquette of diplomacy. Paramount in world-importance has been the agreement of the leading nations of the world in the establishment of the Hague conferences for the amelioration of war. Since a conference of nations can meet and decide on the mitigation of the horrors of war, it is certainly conceivable that a tribunal of nations can prevent war. Such a tribunal would in no respect differ from the Supreme Court of the United States in its fundamental foundations. As our Supreme Court is final in settling all disputes in this country, so the international court would be final in adjusting all controversies between the nations. And such a court is clearly the next decisive step in the promotion of this great task of securing world-peace. If nations can agree to establish war as their arbiter of peace, why can they not establish a more peaceful substitute? It is possible, for there is nothing in the nature of strife that cannot be settled, no quarrel that cannot be judged, no difficulty that cannot be satisfactorily adjusted.