The peculiar character of International Law; the rivalry between the different schools of international jurists, namely the Naturalists, Positivists, and Grotians; the question of language; the peculiarities of the systems of law of the different States, of their constitutions, and many other difficulties, entail the danger that International Courts may become the arena of national jealousies, of empty talk, and of political intrigues, instead of being pillars of international justice. Everything depends upon what principles will guide the States in their selection of the individuals whom they appoint as members of International Courts. Not diplomatists, not politicians, but only men ought to be appointed who have had a training in law in general, and in International Law in particular; men who are linguists, knowing, at any rate, the French language besides their own; men who possess independence of character and are free from national prejudices of every kind. There is no doubt that, under present conditions and circumstances of international life, the institution of International Courts represents an unheard of experiment. There is, however, likewise no doubt that _now_ is the time for the experiment to be made, and I believe that the experiment will be successful, provided the several States are careful in the appointment of the judges. IV. And it must be emphasised that an International Court of Appeal above the one or several International Courts is a necessity. Just as Municipal Courts of Justice, so International Courts of Justice are not infallible. If the States are to be compelled to have their judicial disputes settled by International Administration of Justice, there must be a possibility of bringing an appeal from lower International Courts to a Higher Court. It is only in this way that in time a body of International Case Law can grow up, which will be equivalent in its influence upon the practice of the States to the municipal case law of the different States.