4. _Soolensprudel._—About a mile from the foregoing springs, and in the middle of the valley, near the bank of the river, this remarkable spring was discovered by boring 311 feet through the earth. It does not flow in an even uninterrupted stream, but rises and falls at irregular periods—often with a noise resembling cannon. It generally ebbs and flows eight or nine times in the twenty-four hours. When the water is at its greatest height, it boils, and roars, and foams at a great rate. This spring rises through a salt-water mine, if the expression can be used. Its solid contents are enormous, namely 172 grains in the pint! Of these, common salt alone amounts to 107½ grains—muriate of magnesia 24½ grains—muriate of lime 4 grains—sulphate of soda 25 grains—carbonate of magnesia 6½ grains—carbonate of lime 1½ grains—subcarbonate of iron not quite half a grain—carbonic acid gas 30½ cubic inches. From this it will be seen that, in solid ingredients, the Soolensprudel outstrips all the other springs. In temperature too, it differs from the others, being 66°, or as nearly as possible that of the sea. 5. _Theresienbrunnen._—This springs from a depth of 140 feet, and discharges itself with a bubbling noise like the others. The water is clear as crystal, and whitens the sides of the glass with the carbonic acid gas. The temperature is 52 or 3°. The taste is tart, saltish, agreeably pleasant and refreshing. The quantity furnished is abundant. There are 29½ grains of saline matters in the pint, with 28½ cubic inches of carbonic acid gas. Of these, 18½ grains are muriate of soda—2¾ muriate of magnesia—2½ carb. magnesia—2 carb. lime—1½ sulphate of soda, with some slight quantities of minor ingredients. Between this spring and the Maxbrunnen there is a considerable affinity; but the Theresienbrunnen has the advantage, in possessing a greater proportion of carbonic acid gas, by which the saline matters are held in more complete solution. MEDICINAL EFFECTS AND PROPERTIES OF THE KISSENGEN WATERS.