8vo. [4], 71pp, [52]. Bound by Hering in contemporary gilt-tooled turquoise calf, contrasting red morocco lettering-piece. Marbled edges. . Lightly rubbed and marked, light wear to joints. Marbled endpapers, armorial bookplate of Henry Peter Brougham, 1st Baron Brougham and Vaux, and associated shelf-label to FEP, bookplate of the Turner Collection, The Library, University of Keele to FFEP. Light scattered spotting throughout.

The first edition of a treatise on geometry by Edward Aldolphus Seymour, 11th Duke of Somerset (1775-1855), English landowner and amateur mathematician. A fellow of the Royal Society, and sometime President of both the Linnaean Society and the Royal Institution, Seymour would publish this volume as 'a sequel to the Treatise on the Ellipse' (1842).