This is Volume XIII of eighteen in a series on Political Sociology. Originally published in 1945, this books makes a systematic survey and analysis, as objective as possible, of the tendencies most likely to govern peace-making. The authors intended to avoid making any specific recommendations of their own as to how the labours of peace-making should be undertaken, and to confine themselves to a study of how they were likely to be undertaken in the light of past experience, contemporary proposals, and the present alignment of political powers in the world. In the process of study, discussion and writing, all three authors arrived at certain more definite conclusions. At the same time, the course of events and the increasingly clear trend of official policies seemed to justify more positive assertions and more constructive suggestions than had at first been thought possible. The book, therefore, takes its present hybrid form: of systematic analysis carried forward to certain statements and even recommendations.