This is made from carbonate of baryta in the same method as the preceding preparation from carbonate of lime.

The solution is inodorous, has a disagreeable bitter taste, and is precipitated by the alkalies, sulphuric acid, the soluble sulphates, carbonates, and phosphates, and the soluble salts of silver and lead.

In over-doses, it is an energetic poison, producing inflammation of the stomach and bowels, and symptoms indicating great disturbance of the nervous system.

In medicinal doses, its effects are closely analogous to those of the chloride of calcium, and it is supposed to have the same remedial powers in scrofulous diseases, for which it was formerly considerably used; though the apprehension of its poisonous effects limited its employment. it is at present seldom prescribed. The commencing dose of the solution is from five to ten minims, to be gradually and cautiously increased until nausea, giddiness, or other unpleasant symptoms occur, when it must be again diminished.

Within a few years, chloride of barium has been successfully used in the treatment of traumatic tetanus. in the year 1858, a case of this disease was treated in the hospital of Milan, by Dr. Gnecci, with sixteen grains of the chloride daily, dissolved in a pound of distilled water. The medicine was continued from the 11th to the 21st of April, after which, as the tetanic symptoms had almost disappeared, the quantity was diminished to eight grains. it was omitted on the 26th; and on the 28th of April the patient was dismissed cured. Dr. Gnecci has subsequently succeeded in curing several cases of the same disease with the same remedy. (Ann. de Thérap., 1863, p. 207; from Gaz. Med. Ital. Lombarda.) in cases of poisoning, whether from this chloride or that of lime, the proper antidotes are the alkaline sulphates, which should be given with large quantities of water; and, if necessary in order to evacuate the stomach, recourse must be had to emetics, or the stomach-pump The symptoms must afterwards be counteracted by opiates, and other remedies, which may seem at the time to be appropriate.