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war problems. Great and imperious as war problems are at times like this they are yet simpler than the problems that lie back of them. The justification of war must be found in the principles which we seek to preserve.
I desire to express my indebtedness to many colleagues for helpful suggestions, but especially to my wife, who has read the proof, and to Mrs. Anna Bryan Ayres, who has aided in the preparation of the manuscript.
J. H. T. September, 1917.