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In the process of manufacturing the Hofmann violet by the action of ethylic or methylic iodide upon rosaniline or one-of its salts, there is always produced a considerable quantity of a dark-coloured resinous or pitchlike substance, which has received the name of “Hofmann gum." This by-product varies in amount and consistence according to the shade of violet simultaneously produced being much more abundant when the iodide is employed in large proportion for the purpose of obtaining the bluer shades. It has hitherto received no technical application, but accumulates as a waste refuse in the Aniline Dye-Works where Dr. A. W. Hofmann’s process is used.

II. On new sources of ethyl- and methyl-aniline