Universal conscription, the general mobilization of all agricultural and industrial forces of the folk not engaged in the trenches, the application of every conceivable scientific and mechanical device, the mass movements of soldiery regulated from a common center by a depersonalized general staff: these factors relegate the traditional psychological apparatus of war to a now remote antiquity. The motives once appealed to are out of date; they do not now induce war. They simply are played upon after war has been brought into existence in order to keep the common soldiers keyed up to their task. The more horrible a depersonalized scientific mass war becomes, the more necessary it is to find universal ideal motives to justify it. Love of Helen of Troy has become a burning love for all humanity, and hatred of the foe symbolizes a hatred of all the unrighteousness and injustice and oppression which he embodies. The more prosaic the actual causes, the more necessary is it to find glowingly sublime motives. Such considerations hardly prove that war is to be abolished at some future date. But they destroy that argument for its necessary continuance which is based on the immutability of specified forces in original human nature. Already the forces that once caused wars have found other outlets for themselves; while new provocations, based on new economic and political conditions, have come into being. War is thus seen to be a function of social institutions, not of what is natively fixed in human constitution. The last great war has not, it must be confessed, made the problem of finding social equivalents simpler and easier. It is now naive to attribute war to specific isolable human impulses for which separate channels of expression may be found, while the rest of life is left to go on about the same. A general social re-organization is needed which will redistribute forces, immunize, divert and nullify. Hinton was doubtless right when he wrote that the only way to abolish war was to make peace heroic. It now appears that the heroic emotions are not anything which may be specialized in a side-line, so that the war-impulses may find a sublimation in special practices and occupations. They have to get an outlet in all the tasks of peace. The argument for the abiding necessity of war turns out, accordingly, to have this much value. It makes us wisely suspicious of all cheap and easy equivalencies. It convinces us of the folly of striving to eliminate war by agencies which leave other institutions of society pretty much unchanged. History does not prove the inevitability of war, but it does prove that customs and institutions which organize native powers into certain patterns in politics and economics will also generate the war-pattern. The problem of war is difficult because it is serious. It is none other than the wider problem of the effective moralizing or humanizing of native impulses in times of peace.