is the fruit of one man's extended effort to solve the philosophical problems that underlie the practical dilemmas of human society. This undertaking began when, as an adviser in the U.S. State Department, Mr. Halle found himself groping for the deeper explanation of political problems that could not be understood within the limits of the terms in which they presented themselves, The philosophical system that resulted is proposed here as a basis for the understanding and teaching of politics. It is, however, a complete philosophy of life, not limited to politics. represents an effort to resume progress in the great tradition of political philosophy, to present a foundation for the continued progress of our societies.