MERCIER de COMPIÈGNE, Claude-François-Xavier Éloge du pet, dissertation historique, anatomique et philosophique, sur son origine, son antiquité, ses vertus, sa figure, les honneurs qu'on lui a rendus chez les peuples anciens, et les facéties auxquelles il a donné lieu [...]. Paris Favre an VII de la Liberté [1799] In-18 : front cover -xii-168 pp. (slight discharge of the front cover, a few light russets). Late 19th c. lemon morocco, triple gilt fillet around covers, gilt floral spine, green tabis lining framed with gilt serration, same tabis endpapers, marbled paper double endpapers. A sparkling compilation illustrated with a free frontispiece to the glory of Crepitus, god of flatulence. Contains a.o. a translation of the "Oratio pro Crepitus ventris" and amplified or reworked extracts from the "Art de péter". Ref. Bibliotheca scatologica 88. - BGL II:90. Joint, 4 19th c. opuscules in 1 vol. in-16 nicely bound in red half-chagrin with corners signed I. Smeers (small rubs): 1. [Mars, Prosper] - Guide du Prussien, ou Manuel de l'artilleur sournois, à l'usage des personnes constipées, des personnages graves et austères [...]. Paris, Ponthieu, 1825. Rare bibliophilic edition of this anecdotal history of scatology. - 2 Lubert, Mlle de - Histoire secrète du prince Croqu'étron [...]. Nice, J. Gay et fils, 1873. Textual reprint of the ed. published in Paris around 1790, augmented by a bibliographical note. 1/300 copies (no. 152). - 3 Physiologie inodore illustrée, et propre à plus d'un usage. Paris, Palais-Royal, Galerie Valois 185, et chez tous les libraires, [c. 1840]. (Crop flush with text p. 7 with loss of qqs. letters, russeting, libr. notice pasted to title). - 4. foiriana, a piquant and amusing collection for amateurs [...]. In Foirance, establishment of secret cabinets, n.d. Often reprinted with variants. Ref. Bibliotheca scatologica 98 (1), 23 (4). - BGL II:329 (4), 439 (1), 581-582 (2), III:736 (3). Prov. Ex-eroticis with initials "AV". (2 vols.)