A salt, purging, sulphureous water; the strongest in Great Britain, of the heat of 92°, but it does not lose its sulphureous smell even in a boiling heat. It is perfectly clear; and in taste and smell resembles rotten eggs and sea water combined. It was doubted whether these waters contained any sulphur: but it is now ascertained, and the sulphur is in-the state of hepar sulphuris. A gallon of this water contains one pennyweight twelve grains and a quarter of carbonated lime; four pennyweights twenty-three grains of muriated magnesia; and an ounce seven pennyweights and twelve grains of sea salt. It contains also four ounce measures of acidulous gas, and thirty-five of fetid inflammable gas, such as is separated from hepar sulphuris by vitriolic acid. In small quantities these waters prove diuretic; in large, purgative. They are extremely useful in cutaneous and scrofulous disorders; in piles; as anthelmintics, destroying, if employed so as to purge, lumbrici and ascarides; and in debility of the digestive powers. In dropsical, scorbutic, and gouty cases, they are highly recommended. Externally they are considered asdiscutient and attenuating; and, used as a warm bath, remove stiffness and pains of the joints from strains, hard or scrofulous tumours, and greatly improve the state of old ulcers. When first drunk the water occasions slight giddiness and headach, which are carried off by its laxative effects. It should be used cold and fresh from the spring; and it has been employed externally in form of washes, fomentations, and baths, particularly in cutaneous diseases. See Monro on Mineral Waters, and Garnett on Harrowgate Water. At Harrowgate is also,

1st. The sweet spa, which strikes a light purple with galls, and from a gallon affords, on evaporation, a scruple of solid matter at one time, and eight grains at another: of these sediments, above one half was earth, the rest a vitriolated magnesia.

2. Tuwhet, of which a gallon yielded at one time thirteen grains, at another nineteen, of which three fifths were calcareous earth mixed with ochre, the rest vitriolated magnesia. It was discovered in 1638, and formerly the only one used internally, chiefly in nephritic cases.

3. Alum well, which, from its roughness, was supposed to contain alum; but seems to be impregnated with vitriolated or carbonated iron. Dr. Short properly considers these as chalybeate springs.