GAY-LUSSAC, Joseph Louis & Louis Jacques THENARD. Recherches Physico-Chimiques, Paris, chez Deterville, 1811, 2 vols., 8°, FIRST EDITION, 6 engraved plates (library markings, some browning and spotting), contemporary boards backed in morocco (worn) [Sotheran I, 1498; Honeyman Pt. IV, lots 1460 & 1461] -- BERZELIUS, Jöns Jacob. Essai sur la Théorie des Proportions Chimiques et sur l' Influence Chimique de l' Electricité ... traduit du Suédois, Paris, chez Méquignon-Marvis, 1819, 8° (title and p. 1 torn and repaired, in the latter case with loss, p. 101 torn with loss, library markings), contemporary marbled boards. [Sotheran I, 379; Honeyman Pt. 1, lot 308] (3)