DESCARTES, René (1596-1650). Epistolae. Partim ab auctore latino sermone conscriptae partim ex gallico translate... Amsterdam: Daniel Elzevier, 1668, 2 parts in one vol., 4°, FIRST COLLECTED EDITION IN LATIN, illustrations, 3 full-page, vignette to title (some marginal dampstaining, partly affecting text), contemporary full vellum, manuscript title to spine (rear inner hinge cracked, but holding, corners bumped). [Guibert p. 88; Willems 1393] -- Adrien BAILLET. La Vie de Mr. Des-cartes. Contenant l'histoire de sa philosophie & de ses autre ouvrages, Paris: Mabre Cramoysi, 1693, 12°, FIRST EDITION, engraved frontispiece dated 1692, title printed in black and red (first few leaves wormed, bookplate to verso of title removed with some damage affecting text, title soiled, slight spotting to leaves throughout), contemporary mottled calf, spine decorated and lettered in gilt (upper front joint split, spine wormed, corners bumped) Provenance: bookplate of Joseph Halle Schaffner.