2 parts in one volume, 8vo (219 x 137 mm). Printer’s devise on title-pages. (Minor spotting, some chipping with repairs to preliminary leaves, several leaves uncut.) Half brown cloth over cloth boards, original gray printed wrappers bound neatly in (some repairs to wrappers).

Chasles was a highly influential mathematician and historian of arithmetics who made significant contributions to projective geometry. His collection was so extensive that it took 20 days to disperse, and the supplement is almost always missing.  Taylor, p.123 (“a means of identifying rare old scientific books”).