[René DESCARTES (1596-1650)]. File. L.A.S. from anthropologist Raoul HARTWEG (1914-1993), September 12, 1958, to Jean-Edmond Weelen; 4 pages in-4 on Musée de l'Homme letterhead. Long letter on the subject of Descartes' skull, whose history he recounts in detail from Descartes' death in 1650 to its arrival at the Muséum in 1821 and later at 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 preparatory notes for the writing of this study (ca. 30 p.); plus press clippings, and photographs of portraits of Descartes and Fédé.