Acknowledgment and thanks for permission to use the following selections are herewith tendered to Houghton, Mifflin & Company, Boston, for "Looking Backward," by Edward Bellamy; to Ginn & Company, Boston, for the International School of Peace, for "The Future of War," by Jean Bloch; and to Doubleday, Page & Company, New York, for "Progress and Poverty," by Henry George.