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It is thus directed to be prepared in the Pharmacopoeia of the U. S. (lodin. 3iv; sulphur. 3j.) Rub the iodine and sulphur together in a glass, porcelain, or marble mortar, until they are thoroughly mixed. Put the mixture into a matrass, close the orifice loosely, and apply a gentle heat, so as to darken the mass without melting it. When the colour has become uniformly dark throughout, increase the beat so as to melt the iodide; then incline the matrass in different directions, in order to return into the mass any portions of iodine which may have condensed on the inner surface of the vessel: lastly, allow the matrass to cool, break it, and put the iodide into bottles, which are to be well stopped.