countries. Ants are as completely Socialistic as any community can possibly be, yet they put to death any ant which strays among them by mistake from a neighboring ant-heap. Men do not differ much from ants, as regards their instincts in this respect, where- ever there is a great divergence of race, as between white men and yellow men. Of course the instinct of race-hostility can be overcome by suitable circumstances; but in the absence of such circumstances it remains a formidable menace to the world's peace.
If the peace of the world is ever to become secure, I believe there will have to be, along with other changes, a development of the idea which inspires the project of a League of Nations. As time goes on, the destructiveness of war grows greater and its profits grow less: the rational argument against war acquires more and more force as the increasing productivity of labor makes it possible to devote a greater and greater proportion of the population to the work of mutual slaughter. In quiet times, or when a great war has just ended, men's moods are amenable to the rational grounds in favor of peace, and it is possible to inaugurate schemes designed to make wars less frequent. Probably no civilized nation would embark upon an aggressive war if it were fairly certain in advance that the aggressor must be defeated. This could be achieved if most great nations came to regard the peace of the world as of such importance that they would side against an aggressor even in a quarrel in which they had no direct interest. It is on this hope that the League of Nations is based.
But the League of Nations, like the abolition of private property, will be by no means sufficient if it is not accompanied or quickly followed by other reforms. It is clear that such reforms, if they are to be effective, must be international; the world must move as a whole in these matters, if it is to move at all. One of the most obvious necessities, if peace is to be secure, is a measure of disarmament. So long as the present vast armies and navies exist, no system can prevent the risk of war. But disarmament,