The mode of action of the gas-bath being decidedly stimulant, it should never be employed where stimulants are improper. The disorders in which it is most employed by Dr. Heidler, Dr. Herzig, and other physicians at Marienbad, are the following:—1. Suppressed or scanty menstruation—especially after the waters and common baths have been used without effect. 2. Suppressed hæmorrhoidal discharges, in which the mineral waters may also be employed. 3. In scrofulous ulcers and swellings, aided by the mud-baths and mineral water. 4. Various derangements of digestion, where there is no plethora of any of the abdominal organs. 5. In gouty affections of a painful kind, without actual inflammation, and where the other baths and waters have proved ineffectual. In such cases, the gas-baths often bring out an acid and fætid perspiration on the pained part. 6. In some chronic affections of the sight, as amaurosis, not accompanied by inflammatory symptoms, the local application of the gas has been found useful: also in deafness dependent on torpor of the nerves and membranes of the ear, or where the natural secretion is defective or nul. Great caution, however, is necessary in the local application of streams of this gas to the eyes or ears, where there is any tendency to vertigo, or fulness about the head. The gas-baths are taken locally or generally. In the general bath the patient should be lightly cloathed, as the gas generally induces perspiration. When it is used locally, by way of douche, it may often be applied to the naked part, or with a gauze covering over the surface, especially if to the eyes. Care should always be taken to prevent the introduction of gas into the lungs—or even into the mouth or nose, lest disagreeable consequences should ensue. This new remedy has attracted individuals of both sexes to Franzensbad and Marienbad, from the wilds of Russia, and from various parts of the South and centre of Europe. Those who come with the greatest anxiety, and with the most ardent hopes, or at least expectations, to the gas-baths, are such as have long sighed, but sighed in vain, to become— “The tenth transmitters of some foolish face,” placing, apparently, more faith in the physical operation of the waters, baths, and gases of the spas, than in the intercession of saints or even the prayers which they had offered up at the shrine of the Madonna herself! How far and how often the gas-baths have wrought the happy revolution, I cannot say. The doctors have firmly asserted, and the patients have willingly believed the “flattering tale.” As the gas-baths are seldom trusted to alone, it is impossible to say with accuracy, what share they have in the general restoration of health, and the consequent invigoration of the constitution. Upon the whole, I left Marienbad with the strong conviction on my mind, that its waters and baths were among the most efficient in the list of the German spas.