149 - MATHEMATICS.

MATHEMATICS. - RIVARD (D.-F.). A Summary of the Elements (sic) of Mathematics. Fourth edition. Paris, Desaint & Saillant, 1757, in-8, XV pp.—291 pp.—2 unnumbered folios—291 pp.—2 folios—10 folded plates. Contemporary marbled fawn calf binding, decorated raised spine, red edges. — Corners, caps, and edges rubbed; a few rare stains inside. - OZANAM (Jacques) (1640–1717). Rectilinear and Spherical Trigonometry, with Tables of Sines, Tangents, and Secants, for a Radius of 10,000,000 Parts. And Tables of Logarithms of Sines and Tangents... New Edition... Paris, Jombert, 1741, in-8, 6 unnumbered leaves—103 pp.—followed by unnumbered pages—6 pp. of catalog—2 unnumbered leaves—4 folded plates. Brown calfskin, decorated ribbed spine, title label, red edges. (Contemporary binding).—Corners rubbed, one jaw split, paper slightly yellowed.