4to (204 x 256 mm). (2), 26 pp. With a large (59 x 21.5 cm) folding lithographed plate of the monstrous twins, signed Villain. Bound in mid-19th century marbled boards, rebacked with calf spine; all edges marbled in blue. Some foxing to upper margin of title-page and plate, not affecting lithographed image; 2 cm repaired closed tear to left margin of plate not encroaching on image. - Bound with another obstetrical monograph: Lobstein, Jean-Fréderic. Essai sur la Nutrition du Foetus. Strasbourg, Levrault, 1802. XVI, 150, (2) pp. with 2 engraved plates.