Higgins (Bry[an]): Experiments and Observations Made with a View of Improving the Art of Composing and Applying Calcareous Cements, 8vo, for T. Cadell, 1780 ([?] lacking final blank), old marbled boards (rebacked and recornered in calf) -- Cramer (John Andrew): Elements of the Art of Assaying Metals, 8vo, for Tho. Woodward, 1741, five folding engraved plates (title repaired at inner margin, some browning, final leaves slightly affected by damp, [?] lacking final blank), modern calf-backed boards. (2)