MgC12 + 2Na.

Chloride of Magnesia is prepared by evaporating to dryness a concentrated solution of muriate of magnesia, the chloride being obtained in the state of a fused hydrate. It is a bitter, very deliquescent salt, which acts mildly and favorably as a purgative, causing a flow of bile, and an increase of appetite. On account of its extreme deliquescence the liquid form, prepared by dissolving the salt in its weight of water, is preferred. The dose, diluted, is Formula 778 to

In dental practice the chloride and hypochlorite of magnesia have been employed for bleaching teeth.