Hydrotherapy and medical entrepreneurship: the "water spell" of Ricardo Jorge.

: Between 1886 and 1893, the doctor and hygienist Ricardo Jorge was linked to a commercial and medical project on the waters of GerAas. Known for many centuries and used for therapeutic purposes, they were administered on an empirical basis. When new chemical analyses were first published, the empirical properties of these waters took on a new role in hydrotherapy based on their now proven mineral and medicinal qualities. The article discusses in detail Ricardo Jorge's business venture, framing it in the context of the economic collection and treatment potential of mineral waters and the revival of the phenomenon of hydrotherapy, legitimized by new developments in the chemical analysis of waters. The commercial failure to exploit the water resources highlights the difficulties of this project and the complexity of the professional practice of hydrological medicine, although it resulted in a strengthening of Ricardo's authority and prestige in the field of hydrotherapy.