A powerful caustic, long celebrated by the French and German surgeons in the treatment of Lupus and Cancerous Ulceration. It is composed of equal parts of Quicklime and Potassa c. Calce. When it is to be used, a few drops of Spirit of Wine are added, to form a thin paste. A piece of adhesive plaster, with a hole cut in it, the size of the intended eschar, should be placed over the diseased part. The paste should be left on from five to fifteen minutes, according to the depth of the eschar required. It creates violent constitutional irritation, and is rarely employed at the present day.

* Lancet, July 19, 1862.

Therapeutics, vol. ii. p. 349.