This spring lies about a mile out of the town, and has a greater affinity to the Kreuzbrunn than any of the other wells of Marienbad. Its constituents are as follow:—In the pint there are 17 grains of sulphate of soda—7 grains of muriate of soda—6½ carbonate of soda—3 of carbonate of lime—2 of carb. magnesia—⅓rd of a grain of carbonate of iron—traces of carbonates of strontia, manganese, and lithian—in all 36½ grains—with 146 inches of carbonic acid gas to 100 cubic inches of the water. From the above analysis it will be seen that the Ferdinandsbrunn contains nearly three times as much steel as the Kreuzbrunn, with considerably more of carbonic acid gas; but it contains much less of the sulphates and muriates of soda. Hence it is more tonic, and less aperient than the master-spring, the KREUZBRUNN. The water is clear and transparent in the glass—sparkles like champagne—and has a most agreeable refreshing taste. It leaves a slight smack of ink on the palate. It may be administered in the same class of maladies as the Kreuzbrunn is applied to—and that either simultaneously, alternately, or successively. Thus, where the solvent powers of the former spring are still wanted, but the debility of the patient requiring a more tonic source, the Ferdinandsbrunn may be advantageously conjoined with the Kreuzbrunn, or substituted for it during a period. It may be as well to cite a case or two here from my friend Dr. Heidler. “A gentleman, 60 years of age, who had led a sedentary life, and experienced much trouble of mind, became extremely hypochondriac. When he arrived at Marienbad, his complexion was cachectic—eyes dull and sunk—tongue furred—appetite gone—abdomen distended, but not tender—hæmorrhoids—bowels inactive—discharge of bloody mucus occasionally with the motions—some eruption on the skin—slight wandering gouty pains—skin dry—pulse small and slow. The Kreuzbrunn was first tried, but produced watery evacuations, and distention of the stomach. The Ferdinandsbrunn was therefore substituted at the end of ten days. This water, in conjunction with mud-baths, produced, in the course of five weeks, the most salutary effects, clearing the patient of his hypochondriasis, and nearly the whole of the other symptoms.”