LAVOISIER (Antoine-Laurent de) - PERTHUIS (Léon de) - SAGE (Balthasar-Georges). "L'Art de fabriquer le salin et la potasse. Suivi des Expériences sur les moyens de multiplier la fabrication de la Potasse, par le citoyen Pertuis, & par le citoyen B. G. Sage. Pour faire suite à l'Ouvrage intitulé : Instruction sur l'établissement des Nitrières, & sur la fabrication du Salpêtre. Paris : Cuchet, An II [1794]. [Followed by]: LAVOISIER (Antoine-Laurent de) - MACQUER (Pierre-Joseph) - SAGE (Balthasar-Georges). Instruction sur l'établissement des nitrières, et sur la fabrication du salpêtre." Paris : Cucher, An II [1794]. - 2 works in one volume, in-8, havana half calf with corners, smooth spine decorated (period binding). "New edition of these two treatises by Antoine Laurent de Lavoisier, written in collaboration with Léon de Perthuis, Balthasar-Georges Sage and Pierre-Joseph Macquer. They were first published in 1779 and 1776 respectively, the first being a complement to the second. Both texts were part of the research carried out by the Régie des poudres et salpêtres, created by Turgot on July 1, 1775, of which Lavoisier was one of the four régisseurs. The aim of this work was to provide saltpetre manufacturers with the tools they needed to incorporate scientific advances into their practices. "L'Art de fabriquer le salin et la potasse" includes a fold-out table and 4 fold-out plates engraved by Delettre. The second work is also illustrated with 4 folding plates engraved by Delettre. Wormholes on spine. Some spotting and foxing. Light spotting in the second book."