Verdross, A. Keywords: Peace | International law | Mots clefs: Paix | Droit international | ABSTRACT Alfred Verdross explains in the introduction to his course that one cannot understand the social facts if one do not penetrate the thoughts at the basic level. The thesis advanced by the author is that positive law of nations is obscure if one does not know its creative ideas, developed precisely by the founders of international law. The author therefore begins with a presentation of the development and structur…