This is the lion of the place. It is the strongest of them all—its predominant qualities being _solvent_, with an ulterior stimulant and tonic property. It boils up under a beautiful building resembling a small Grecian temple, from the entrance of which a fine shaded promenade, with a bazaar on one side, and a dell on the other, extends to the Carolinenbrunnen. In a pint of this spa there are 28½ grains of sulphate of soda—10 grains of muriate of soda—7½ ditto of carbonate of soda—3 grains of carbonate of lime—2 of carbonate of magnesia—⅒th of a grain of iron—some vegetable extract, &c. making 52 grains in the whole. The cubic inch of water contains about a cubic inch of carb. acid gas. _Physiological Effects._—This water sits easy on the stomach. Five or six glasses are generally taken in the morning, without inconvenience, and even with pleasure. When impurities, however, exist in the stomach or bowels, the Kreuzbrunnen often causes sickness or disagreeable eructations, and then some opening medicine should be taken. If this water causes a sense of distention, weight, or oppression at the stomach—or diarrhœa, or loss of appetite, it is a sign that the water is taken in too large quantity—or taken too fast—or taken too long—or, in fine, that it is not agreeing with the individual. Very often, however, it is more owing to errors of diet than to the nature of the waters that these phenomena occur. In general the appetite is increased by the Kreuzbrunn, after the third or fourth day. It augments considerably the action of the kidneys, the water becoming more pale and copious—and this effect generally continues during the period of the cure. It acts on the bowels also—five or six glasses usually operating two or three times. The exported water is more aperient than that taken at the source. The evacuations are often of a green, black, or brown colour—or glairy, and gelatinous. Sometimes dark coagulated blood is passed. When the motions become watery, the Kreuzbrunn is not answering the purpose. The discharges above-mentioned afford indescribable relief to the sufferer. Things do not always, however, proceed so quietly. Occasionally the abdomen becomes distended—the pulse accelerated—the bowels get confined—and the fears of the hypochondriac are then greatly augmented. According to Dr. Heidler, Dr. Herzig, and others, these symptoms are _critical_, and soon disappear, when Nature has accomplished her object by a discharge of vitiated excretions. It is quite a mistaken notion that the dark or green colour of the motions is owing to the minute proportion of steel contained in the water.