THORE (Jean) - MEYRAC (Pierre): Mémoire sur les eaux et boues thermales de Dax, Préchac, Saubusse et Tercis. Bordeaux: A. Brossier, 1809 [Followed by]: SERRES (Hector). Notice sur la culture du pin maritime dans les Landes, et sur la fabrication des produits appelés matières résineuses. [Bordeaux, 1837]. 2 pamphlets in one volume, in-8, dark green half-maroquin with long grain and small corners, smooth spine decorated (binding circa 1840). Set of 2 very rare scientific pamphlets concerning the Landes region. The first was written by physician and lichenologist Jean Thore (1762-1823) and pharmacist Pierre Meyrac, and concerns the history, description and, above all, chemical analysis of the thermal waters and mud of Dax, Préchac, Saubusse and Tercis. The second pamphlet was written by the pharmacist and hydrologist Hector Serres (1807-1899), who was also mayor of Dax. A personal copy by Hector Serres, whose autograph signature "Hector Serres Dax" appears on the first endpaper. It has been enriched by two autograph letters from Baron de Cardaillac, dated 1887, addressed to Serres, and an autograph note from the latter on one and a half pages in-8. Rubbing from use, corners dulled. Provenance: Hector Serres. - Antonio Aparisi-Serres (1883-1956), grandson of Hector Serres.