DESCARTES (René). Together 7 volumes. Les Passions de l'âme. Paris, Pepingué, 1650. In-12, fawn basane, spotted edges (contemporary binding). Paris reprint of the original edition given by the Elzevier in 1649. Cut at the top of the title. Worn binding. Les Passions de l'âme. Rouen, Besongne, 1651. In-12, brown calf, spine decorated, marbled edges (contemporary binding). Spine restored, endpapers reinforced, modern handwritten bookplate. Lettres. Paris, Henry Le Gras, 1659. In-4, fawn basane, red edges (contemporary binding). Second volume of the Lettres. Binding very worn, first quire almost detached. Les Méditations métaphysiques. Paris, Henry Le Gras, 1661. In-4, brown spotted calf, spine decorated, spotted edges (contemporary binding). Second French edition. "This work had already been revised and corrected by Descartes in 1647, but in this edition we find for the first time a letter from Descartes to the R. P. Dinet and the version of the Seventh Objections and their Answers. These texts are missing from both the original Latin edition of 1641 and the first French translation of 1647. There are numerous variants between the text of the first French edition and that of the second edition of 1661, Clerselier having been dissatisfied with the 1647 translation" (Guibert). Loss of leather on one headpiece and on the binding. First endpaper missing. Les Principes de la Philosophie. Rouen, Berthelin, 1679. In-12, stiff ivory vellum, spotted edges (Modern binding). French translation by Abbé Picot, illustrated with numerous woodcuts in the text and several full-page illustrations. Some foxing. Les Principes de la Philosophie. Rouen, Besongne, 1698. In-12, brown calf, spine decorated, speckled edges (contemporary binding). French translation by Abbé Picot, illustrated with numerous woodcuts in the text and several full-page illustrations. Binding rubbed, headbands, spines and corners restored. Les Principes de la Philosophie. Paris, David, 1724. In-12, spotted calf, spine decorated, red edges (contemporary binding). Edition illustrated with 4 folding plates. Damage to binding.