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Rh States; Mr. René A. Wormser, an American attorney who assisted the author in research work in Germany during the summer of 1922. Dr. Gottlieb Betz, of Columbia University, and Dr. John Mez, American correspondent of the Frankfurter Zeitung, have aided in the translation of important documents.

Professors Carlton J. H. Hayes and William R. Shepherd, of Columbia University, have been patient advisers and judicious critics of the author during the preparation of his manuscript. To them he owes much, as teachers who stimulated his interest in international relations, and as colleagues who cheerfully coöperate in any useful enterprise. Professor Parker Thomas Moon, of Columbia University, also has read the manuscript and offered many valuable suggestions.

EDWARD MEAD EARLE

Columbia University June, 1923