The first two of these books complete and carry forward the Canada in World Affairs series to April 1963, the end of the Dief enbaker government. (The volume by Richard A. Preston, covering the period 1959-61, was published out of sequence in 1965.) The curiously titled third book is the sequel, covering the life of the Pearson government, to journalist Newman's controversial and successful Renegade in Power: The Dief enbaker Years; as the book's dust-jacket indicates Mr. Newman is already working on a history of the Trudeau period, it appears his instant histories of successive Canadian governments have come to resemble the ciia series as a standard, unofficial, serial account of Canadian political affairs. Of the three, only Professor Lyon's book fully measures up to one's legitimate expectations. Professor Lloyd's volume1 covers the first two of the Diefenbaker period, from June 1957 to the naming of Howard Green as secretary of state for external affairs in June 1959. For three months each at the beginning and at the end of this period, Mr. Dief enbaker himself held the External Affairs portfolio; for the eighteen months in between, it was held by Sidney Smith. Salient international political events during the period were the launching of the first Sputnik in October 1957 and the nato heads of government meeting which authorized the establishment of nuclear stockpiles in Europe for joint, allied use but under American custody in December 1957. For Canada, the period was marked by momentous developments in defence policy: the formation of norad; the cancellation of the Arrow high-performance aircraft; the selection of weapons and roles for Canadian forces in North America and Europe entailed the acquisition of nuclear warheads. The theme of the book is that Canada in 1957 had at least as much international influence as at any time in its history and this influence began to decline during the next two years (p. 245), not so much because of mistakes of the Diefenbaker government as because of external factors. The change of governments in 1957 was significant in this regard mainly in revealing the degree to which Canadian influence had depended on Mr. Pearson's personal prestige, rather than on more permanent factors. Thus, any successor government, not only one led by Mr. Diefenbaker, would have had to accept a diminution in Canada's international influence. Professor Lloyd makes no general evaluation of the government's international performance during the period, but his account suggests no serious criticisms. Indeed, he puts forward, without embracing it, an original defence of the government's controversial postponement of a decision on nuclear weapons: it gained time until CanadianAmerican relations were less sensitive than in 1957-8 and were thus