Commander Kenworthy has a spectacular way of tackling current problems. In this book he writes not only from his own experience, but with the aid of George Young, a widely travelled and observant English diplomat. At bottom the theme is that developed in the author's "Remaking of Modern Armies." Like military strategy and tactics, naval warfare has been revolutionized by the advances of modern science, and consequently the old problem of freedom of the seas is out-of-date. All this is brought out clearly in the first three historical chapters of the book, which include an interesting account of the Geneva Conference and its failure. Perhaps the weakest part of the volume is the constructive part, in which the writers call for a settlement of the Anglo-American tension by the conclusion of a compulsory arbitration treaty, disarmament by sea except for police purposes, and the exercise of police activity only by mutual understanding. The obvious criticism of the plan is that it leaves out of account the other nations of the world and that it does not in actual fact settle the question at issue.