The need felt by EUGène Hénard (1849-1923) to influence the city of his time would lead him to be present in the civic discussion with his writings and proposals drawn on the transformation of PARís. And he did so with such propriety that he would achieve an important international influence and contribute to establishing the then nascent modern urbanism. As Jean-Louis Cohen explains in the preface to this edition, it is necessary to separate the interpretation of Hénard's works from those teleological readings that reduce them to a kind cie of corpus of principles necessarily leading to urban functionalism or rigidly oriented towards the definition of the city of the future.