like the observance of contracts, the breach of a treaty might be a real and not merely a formal ground for war, since it would tend to weaken the practice of deciding disputes by agreement rather than by armed force. In the absence of such a practice, however, appeal to treaties is only to be regarded as part of the diplomatic machinery. A nation whose diplomacy has been skilfully conducted will always be able to find some treaty or agreement bringing its intervention within the rules of the diplomatic game when it believes that its interests demand war. But so long as treaties are only observed when it is convenient to do so, the rules of the diplomatic game have nothing to do with the question whether embarking or participating in a war will or will not be for the good of mankind, and it is this question which has to be decided in considering whether a war is justified or not.
II.
It is necessary, in regard to any war, to consider not its paper justification in past agreements, but its real justification in the balance of good which it is to bring to mankind. At the beginning of a war each nation, under the influence of what is called patriotism, believes that its own victory is both certain and of great importance to mankind. The praiseworthiness of this belief has become an accepted maxim: even when war is actually in progress it is held to be natural and right that a citizen of an enemy country should regard the victory of his side as assured and highly desirable. By concentrating attention upon the supposed advantages of the victory of our own side, we become more or less blind to the evils insep-
