4to. (2), XIV, 164, (2) pp. 1 blank leaf. With 10 numbered folding engraved plates, including 2 plans. - (Bound with) II: Bertrand, Philippe. Mémoire et discussion sur les moyens de rendre le Doubs navigable [...]. Paris, Goeury, 1804. (4), 31, (1) pp. With 1 folding engraved plate. 19th century half calf over marbled boards with giltstamped spine. First edition. - The "excellent treatise" (cf. Schulz) on the siltation of French ports in the Mediterranean by the engineer and composer Mercadier, who was commissioned by the officials of the department of Languedoc to inspect ports in France and abroad as engineer of ports and dikes. He points out the important role of near-shore currents carrying sand into the harbour basins. The splendid plates, created by Jacques Bernard Mercadier, the author's brother, illustrate the process of siltation based on calculations and mathematical functions. The two plans, also by Mercadier, show the coast of the Languedoc. - II: First edition of this essay about navigation on the river Doubs, an important connection between the Rhône and the Rhine, by the leading engineer of the Rhône-Rhine Canal, Bertrand (1730-1811). The engraved plate shows the sluice constructed in Gray sur la Saône in 1787. - A good, clean copy. Brunet IV, 5295. Poggendorff II, 121. Schulz, Versuch einiger Beiträge zur hydraulischen Literatur I, 61. Kat. der Commerz-Bibliothek in Hamburg 360. Rouse, Historic Writings on Hydraulics 64. - II: Das gelehrte Frankreich V, 51. Girault de St.-Fargeau, Bibliographie historique et topographique de la France 178. For Bertrand cf. Poggendorff I, 170.