D. Mc Nair, Arnold Keywords: Wars | Treaties | Mots clefs: Guerres | Traités | ABSTRACT Arnold Mc Nair proposes to dedicate his course to the research and collection of materials in the form of judgments and diplomatic controversies rather than the discussion of theories. After a historical overview and preliminary observations, he thus successively studies the different categories of treaties which can, besides, overlap: the treaties relating to permanent laws, the treaties conferring rights of extraterritoria…