The events in Manchuria during the fall of 1931 have again focussed considerable attention upon the problems of treaty enforcement, a matter which has attracted great interest since Bethmann-Hollweg’s famous statement about “a scrap of paper” in 1914. The discussion and study of sanctions, of implementation and putting “teeth” into pacts and treaties, have been widespread since 1919, and two or three schools of thought have arisen in regard to this question, which is one of important current political and legal concern.