This has been introduced into notice by Mr. Marshall, of London, as an excellent application to warts on the genital organs, whether of syphilitic origin, or from other causes. It may also be used for the other purposes of the eseharotics. Dr. Marshall used it in the form of solution, made by dissolving one hundred grains of the crystallized acid in a fluidounce of distilled water. {Lancet, Am. ed., May, 1859, p. 413.) For a more particular account of this acid, see the U. S. Dispensatory (12th ed., p. 35).

Probably all that can be effected by this class of medicines can be gained from the escharotics above described. But numerous other substances, besides those mentioned, have similar properties, and have been more or less used. The following is a list of a few of the least valueless among them.

The stronger solution of ammonia, if allowed to remain in contact with the skin a few minutes longer than is necessary to vesicate, say from ten to fifteen minutes, will produce a slough, and may be used for this purpose in cases of great urgency. (See II. 755.) Hydrate of soda is little less efficient than caustic potassa. Lime also is escharotic, and has occasionally been used in fungous ulcers. The chlorides of soda and lime have slight escharotic powers, as also have the carbonates of the alkalies. Of the metallic preparations, chloride of antimony or butter of antimony, Subacetate of copper, and red oxide of mercury may be added to the list. Strong acetic acid belongs to the same category, and has been used in certain cutaneous eruptions, especially porrigo, applied by a camel's-hair pencil to each eruption, and in chancre.