Boycotts have become so popular and are so widely discussed that this special study, rigorously scientific, will be very welcome. The authors take a broad view of their problem, and do not shrink from consideration of the boycott as a general measure of non-violent coercion. With respect to China they examine in detail the long series of boycotts against the United States, Great Britain and Japan, that have marked the history of the past generation. It is obviously difficult in many cases to gauge at all accurately the effect of the policy, but it is clear that most of the Chinese boycotts have been effective enough to make them serious. Apart from their economic power, they have been shown to have a distinct publicity value and to be far from negligible as a force making for national solidarity. On the other hand, they have at times been as costly to the Chinese themselves as to the boycotted nation. All these factors are taken into consideration by the authors, whose book is a contribution of real value to the study of international relations.