The liberal use that historians of the French language have made in recent years of the Académie de l'Art poëtique of Pierre de Deimier, arouses interest in the work itself. M. Brunot, in his admirable Histoire de la Langue française, resumes his criticism of the Académie with the words: “Bref, ce livre fait un contraste complet avec ceux qui l'ont précédé.” A study of the sources of Deimier shows, however, that the contrast is far from complete. Whatever contrast exists, lies largely, not in the principles of the doctrine, but in the interpretation and application of these principles.