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Paul, beginning to smell a rat, examined the notice with closer attention, and soon detected the erasion where "Fifth" had been substituted for "Third Form."

Cauterization, scarification, erasion and excision are variously practised; the particular method depending, in great measure, upon the extent of the disease, the part involved, and other circumstances.

By the use of such caustics as caustic potash, chloride-of-zinc paste, pyrogallic acid, arsenic, and the galvano-cautery; and by operative measures, such as excision and erasion with the dermal curette, and by the x-ray.

Erasion.—The parts are thoroughly scraped with a curette, and a supplementary caustic application made, either with caustic potash or several days' use of the pyrogallic-acid ointment.

Of these various operative methods those now most favored are erasion and excision, punctate and linear scarification methods are now rarely employed.