When somewhat greater activity is required, and especially in febrile conditions, the neutral salts are indicated. Of these, sulphate of soda, sulphate of magnesia, or common salt may be used, in the dose of from two to four ounces, dissolved in a pint or more of warm water. The late Dublin Cathartic Enema (Enema Cathauticum, Dub.), adopted, with little change, in the British Pharmacopoeia, under the name of "Enema Magnesia Sulphatis,"consisted of an ounce of sulphate of magnesia, a fluidounce of olive oil, and a pint of barley-water.