Constitutional Power and World Affairs, Columbia University Lectures, on the George Blumenthal Foundation, for i918, by George Sutherland. New York, Columbia University Press, 1019, pp. vii, 202. This book is one of the most interesting and thoughtful commentaries on certain phases of our Constitution which has appeared in many years. During his two terms in the United States Senate Mr. Sutherland came to be recognized as one of the ablest constitutional lawyers of the country, and his retirement in 1917 was a distinct loss to our public life. The present book is the product not only of exact, scholarly study of the subject, but is enriched by the varied experience of its author in the actual moulding of our governmental institutions during an important period. This appears particularly in the chapters on the treaty-making power.