SIMPSON (THOMAS): Mathematical Dissertations on a Variety of Physical and Analytical Subjects, London, for T. Woodward, 1743, 4to, first edition (upper margins waterstained, occasional marginal repairs, some browning), contemporary half calf (upper cover detached); Miscellaneous Tracts ... in Mechanics, Physical-Astronomy, and Speculative Mathematics, London, for J. Nourse, 1757, 4to, first edition, 3 folding engraved plates, contemporary calf (upper cover detached) [Sotheran I, 4399: 'Rare']; Essays on Several Curious and Useful Subjects, London, for H. Woodfall jun. for J. Nourse, 1740, 4to, first edition, title printed in red and black [Sotheran I, 4397], bound with -- MARTIN (BENJAMIN): The Theory of Comets Illustrated, in four parts, London, for the author at the sign of the Visual-Glasses and Globe, 1757, 4to, first edition, contemporary sheep (spine worn). (3)