Mr. Hartley fears for the security of the United States after German hegemony has been established over Europe and Africa, and when Japan rules Asia. Our security, he shows, cannot be purchased by defending our own territory alone, but only by protecting all the Americas from European and Asiatic penetration. He tells us concretely what this will necessitate in terms of policy and strategy. Among other things, Mr. Hartley wants us to coöperate with the anti-aggression Powers. His diagnosis and proposals are more convincing in the political than the strategical field.