It is rare for a careful study of international relations to support a comforting, optimistic conclusion. Haas makes a strong case for the view that in dealing with the manifold threats to the Mediterranean there has emerged "a large amount of cooperation . . . of a new form . . . more comprehensive, future oriented, and sensitive to environmental interlinkages between issues" than was to be expected. How this has come about, and the key part played "by the influence wielded by specialists with common beliefs," is traced in detail in this excellent study in a field where governments are facing new problems and new possibilities-and too often following their old, easily understood and counterproductive ways.