[Comparison of the effects of carbonated baths with those of carbon dioxide baths, "dry baths"].

Therapeutic activities of CO2 water bathes are explained by a synergism between many factors. The first ones are related to immersion it-self: hydrostatic pressure and Archimedes force inducing orthosympathetic inhibition and muscular relaxation. The second ones depend on the pharmacological properties of carbon dioxide acting directly on the blood vessels of the skin, causing vasodilation and heat sensation. As "dry" carbon dioxide bath is devoid of the physical factors which are necessary for a successful therapeutic activity, such an administration has no interest in balneotherapy.