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DR. WITTSTEIN obtained a ssmple of iodine containing much iodine cyanide, distributed throughout its mass in the form of white needles. By rubbing a weighed quantity with an excess of mercury, washing out the iodine cyanide and weighing the residue of mercury and mercurous iodide, it was found that the sample contained 28.75 per cent. of the iodine cyanide. On endeavouring to remove the impurity by sublimation (on the large scale), so much iodine was found t o accompany the cyanide that thedoi:10.1039/js8712400763 fatcat:27hwaivjkrewzesjinsgexw5ve