GAY-LUSSAC, J. L. (1778-1850). Instruction sur l'Essai des Matières d'Argent par la Voie Humide, Paris: 1832, 4°, 6 folding engraved plates, original wrappers (backstrip torn, stitching broken) -- Henry MANNINGHAM. A Complete Treatise of Mines, London: 1756, 8°, 21 engraved folding plates (perforation stamp on title and one text leaf, ink stamp on verso of plates, title repaired at inner margin, second leaf detached, browned), 19th-century half morocco (worn); and 5 others. (7)