La Chapelle, is a large imperial city, situated in the duchy of Juliers, on the confines of Flanders, seven leagues from Spa; it contains many springs of hot sulphureous waters, which supply a number of baths. On the vaults above the springs and aqueducts of these waters is found every year, when they are opened, a quantity of fine white-coloured flowers of sulphur, which has been sublimed from the waters. The heat of the waters of the hottest spring, Dr. Lucas says, raises the quicksilver in Fahrenheit's thermometer to 136; Mons. Monet to 146; and the heat of the fountain, where they commonly drink, to 112, according to Dr. Lucas. Sir T. Bergman obtained from a Swedish kanne 27 grains of lime saturated with aerial acid, 29 grains of sea salt, and 70 grains of mineral alkali. These waters are powerfully diaphoretic, and diuretic; and, if taken in quantity, prove purgative. Of the three hot European waters of note; viz. that of A ix la Chapelle, Bourbon, and Bath, the first abounds more eminently with sulphur, and is the hottest, the most nauseous, and purgative. The Bath waters possess the least of these qualities. In all cases it is the best to begin with small quantities, and low degrees of heat, and gradually increase them, agreeable to the effects and constitution of the patient. In cases of dyspepsia, and foulness of the primae viae, they are said to be efficacious: in rheumatism, scurvy, scrofula, cutaneous diseases; in hysteria, and hypochrondriasis; melancholy, stone, and gravel; in paralytic complaints, and in many-other cases, they should be considered as invigorators of the system, deobstruent, and evacuant. They are improper in all hectic cases, putrid disorders, where the blood is in a dissolved state, or the constitution much broken down. The times of drinking these waters are from the beginning of May to the middle of June; or from the middle of August to the latter end of September. See Aquae minerales. See Monro's Medical and Pharmaceutical Chemistry, vol. ii. Dr. Williams on the Waters of Aix la Chapelle, etc.