Such pacifism and the dream of universal peace are no new ideas in the world. Like the philosophy of war pacifism has a long history. There have been pacifists everywhere and presumably at all times, since pacifism is quite as much a temperament as it is an idea or a philosophy. Cramb tells us that all recent centuries have had their doctrines of pacifism, each century having its own characteristic variety. In the time of the Marlborough wars, there appeared the book of Abbe de St. Pierre denouncing all wars. In the middle of the nineteenth century there is the doctrine of the Manchester school, maintaining that the peace of Europe must be secured not by religion, but by the cooeperation of the industrial forces of the continent. Finally, says Cramb, we see the characteristic thought of the twentieth century in the position that war is bad because it is contrary to social well-being and is economically profitless, alike to the victor and the vanquished. This is the pacifism of the socialist who holds that the ties of common labor and economic state are fundamental, and divisions into nationality are secondary and unimportant; and that militarism belongs to the pernicious state of society which perpetuates capitalism and privilege and to government as a function of the favored classes. This is certainly not the place to try to put order into this conflicting mass of opinion about war and peace by working out the principles of a philosophy of good and evil, since this would mean to attack one of the most fundamental of all problems of philosophy. It seems to be plain, however, that neither upon biological grounds nor by ethical principles, nor by finding any consensus in the desires and opinions of thinkers can we reach any hard and fast conclusions about the good and evil of war. It is rather by a broad interpretation of the world and of history and the nature of national consciousness, by some genetic view of national life, that we are most likely to see our way toward a practical view of the present good and evil of war. War is a phase of the whole process of social development of nations. We think of nations as living and growing, and of a world which is gradually maturing. War obtains a natural explanation on sociological and psychological principles, not as a disease, but as a natural consequence and condition of the formation of nations, or of any type of horde or group. In the course of the development of nations we see psychological factors coming more and more to the front. Desires which are more or less consciously avowed become the motives of history. It is in the play of these desires: their fixation, their generalization, and transformation, the manner in which they become attached to specific objects, that we seek the explanation of wars and of the especial psychology of nations. Nations have lived secluded and guarded lives, because of the nature of the desires which were most