Origin. - Prepared by heating washed sulphur and iodine in a flask until the ingredients combine.

Description and Properties. - Brittle masses, of a crystalline fracture and a grayish-black, metallic luster, having the odor of iodine and a somewhat acrid taste. Almost insoluble in water; soluble in about 60 parts of glycerin; very soluble in caibon disulphide. Alcohol and ether dissolve out the iodine, leaving the sulphur. Sulphur iodide should be kept in glass-stoppered bottles, in a cool place.

Dose. - 1-5 grains (0.06-0.3 Gm.).