1961. New Cartesian Edition. 1057 pages. No dust jacket. Green cloth covered boards with gilt. Pages remain clear with minimal tanning and foxing. Previous owner's inscription to front free end-paper. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces. Moderate crushing to spine ends, with splitting, fraying and loss to the head, tail and joints. Book has a slight forward lean. Gilt lettering is darkened. Moderate tanning to spine.