The baths of Marienbad are on a splendid scale—including the mineral water—the gas—and the mud baths. The grand source of the waters for bathing is the MARIENBRUNN, which furnishes 5280 cubic feet of water in 24 hours. The basin is large and capacious—entirely covered over—and the carbonic acid gas boils up in all directions, and in globes and globules of all sizes, with astonishing vehemence and agitation. The disengagement of gas here is, in my opinion, much more striking and wonderful than at the Cold Sprudel and its neighbour at Franzensbad. There is always a thick stratum of this deadly gas incumbent on the surface of the water. There is an admixture of sulphuretted hydrogen gas with the carbonic. All the experiments that are made on animals at the famous Grotto del Cane, near Naples, may be repeated here with perfect success. The Marienbrunn is more elevated than the bathing-establishments, so that the water is conveyed fresh from the source, through pipes that prevent all decomposition. PHYSICAL AND PHYSIOLOGICAL EFFECTS OF THE BATHS. 1. Soon after entering the bath—say at blood heat—innumerable globules of carbonic acid gas are seen on the surface of the body. 2. Many people perceive a redness of the skin, soon after immersion, accompanied by a sense of heat, even when the bath is not above 88° or 90° of Fahrenheit. 3. Some people of irritable and sensitive constitutions, on the contrary, experience a slight shiver, even when the temperature of the water is above that of the blood. This phenomenon is, however, rare. 4. The bath occasions a prompt and copious secretion from the kidneys. 5. Many people who have had old wounds, fractures, or ulcers, feel pains in the parts, while immersed in the water. 6. The same may be said of gout and rheumatism; and this renewal of pains is considered a favourable omen. 7. Old and ill-conditioned ulcers soon assume a more healthy appearance under the use of the baths, and take on a more active, or even inflammatory condition. Ulcers ought to be covered with oil-silk or other defence while the patient is in the bath. 8. In the course of the bathing—generally after ten or fourteen days, any eruptions that previously existed become more developed—and very often new cutaneous eruptions come out. These are considered to be more or less salutary. The Marienbrunn water is much weaker than the Kreuzbrunn and other drinking springs, and is soon decomposed by exposure to the atmosphere. These baths are contra-indicated, or even prejudicial in cases of dropsy, phthisis, aneurysms, irritations or inflammations of any important organ, especially if accompanied by fever or suppuration—disposition to hæmorrhages, or vomitings of blood—disposition to miscarriage—paralyses the result of apoplexy. With these exceptions there are few chronic diseases which may not be benefitted by the Marienbad baths in conjunction with the internal use of the waters.