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Mix the subcarbonate of iron and the muriatic acid, and digest for two hours; pour the solution into a gallon of the distilled water: set aside for an hour, and pour off the supernatant liquor. To this add the liquor potassae; wash the precipitate formed frequently with water, and while yet moist, mix it with the bitartrate of potassa and half a gallon of the distilled water. Keep the mixture at the temperature of 140 for 30 hours, frequently stirring; filter the solution, and evaporate by means of a water bath, at the same temperature, to dryness.- (Ph. U. S.) It is one of the mildest of the salts of iron, and not unpalatable. The Tinctura Martis Aperitiva, Tincture of Ludwia; Alcohol cum Sulphate Ferri tartarisatus; Tinctura Martis Glauberi is, essentially, a solution of this salt. It is also called Eau de Boule, and is used in contusions. Helvetius's Styptic was composed of the filings of iron and tartar, mixed to a proper consistence with French brandy. It was called in England Eaton's Styptic; but this is now formed of Sulphate of Iron.