[René DESCARTES (1596-1650)]. Dossier. L.A.S. de l'anthropologue Raoul HARTWEG (1914-1993), 12 septembre 1958, à Jean-Edmond Weelen ; 4 pages in-4 with the Musée de l'Homme's letterhead. A long letter about Descartes' skull, the story of which he tells in detail from Descartes' death in 1650 to his entry into the Museum in 1821 and then into the Musée de l'Homme. Jean-Edmond WEELEN (1903-1975). Autograph manuscript (incomplete) of his study on "René Descartes, René Frédé et l'édition française des Méditations métaphysiques" (19 p. in-8), and the preparatory notes for the writing of this study (ca. 30 p.); plus press clippings, and photographs of portraits of Descartes and Fédé.