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[SCIENCE]. EHRMANN, Friedrich Ludwig (1741-1800) and LAVOISIER, Antoine Laurent (1743-1794). Essai d'un Art de Fusion, a l'Aide de l'Air du Feu… Suivi des Memoires de Mr. Lavoisier… Strasbourg: Jean George Treuttel and Paris: Cuchet, 1787. 8vo. Illustrated with 3 folding engraved plates. 366, [2, ads] pp. Bound in contemporary full mottled calf, spine tooled in gilt in compartments, five raised bands, burgundy gilt morocco lettering label, marbled endleaves, all edges red (some wear to binding, hinges just starting, one plate with additional creases from poor folding, some minor toning to text). Fine. FIRST EDITION IN FRENCH OF EHRMANN'S WORK, AND THE FIRST EDITION OF LAVOISIER'S MEMOIRS. “Friedrich Ludwig Ehrmann, professor of physics at Strasbourg, was one of Lavoisier's correspondents and one of the earliest converts to his new chemical theories. A series of experiments on which Ehrmann's work... is based were conducted at the same time as Lavoisier was working on the effects of high temperatures on various substances. The results that both obtained... were so similar that Lavoisier, who must have seen Ehrmann's manuscript before its publication, requested that his own memoirs on the subject be printed together with Ehrmann's essay…"