One of the best scholarly treatments of an important subject. The author deals almost exclusively with the legal aspects of the problem and more especially with the machinery provided by the Council of the League and its working. Reviewing the application of the minorities provisions in the last decade, the author comes to the conclusion that these provisions have by no means proved futile. On the other hand, he points out several weaknesses in the present arrangement and takes full account of the complaints made from various sides. He stresses the fact that conciliation rather than judicial decision has been the method followed and indicates that, despite the advantages of this procedure, advance must be sought in the extension of action through the courts.