(OPIUM.) Crumpe, Samuel. An Inquiry into the Nature and Properties of Opium. * Brachet, Jean-Louis. De l'Emploi de l'Opium dans les Phlegmasies

(OPIUM.) Crumpe, Samuel. An Inquiry into the Nature and Properties of Opium. * Brachet, Jean-Louis. De l'Emploi de l'Opium dans les Phlegmasies des Membranes Muqueuses, Séreuses et Fibreuses. * Harley, John. The Old Vegetable Neurotics: Hemlock, Opium, Belladonna, and Henbane... including a Complete Examination of the Active Constituents of Opium. Together, 3 volumes. 8vo, Harley in original cloth, shaken, spine faded and damaged at top, the others in various contemporary bindings, quite worn, covers detached, Brachet lacks backstrip; some foxing, institutional stamp on titles; institutional bookplates. first editions. London, 1793; Paris, 1828; London, 1863