_A plaster for cicatrizing the more simple ulcers._ Of wax, dr. xl; of litharge, dr. xxxv; of diphryges, dr. viij; of myrtle-oil, half a hemina. The plaster called phœnicinum, that from calamine, the myrsinatum, and the like, are also applicable in such cases. For ulcers of difficult cicatrization: Of wax, of myrtle-oil, of each, dr. vj; of calamine, oz. vj; of lead, of frankincense, of each, dr. ij; of fissile alum, of burnt copper, of each, oz. j; of scraped verdigris, dr. ij; dissolve them singly. For chronic ulcers, and such as are of difficult cicatrization: Of calamine, dr. viij; of chrysocolla, dr. viij; of fissile alum, dr. viij; of verdigris, of the flakes of copper, of each, dr. j; of pine-rosin, dr. xl; of wax, dr. c; of myrtle-oil, q. s.—_Another_: Of wax, of pine-rosin, of each, oz. vj; of calamine, oz. vj; of crude chalcitis, oz. iij; of myrtle-oil, q. s. The calamine and the chalcitis are to be triturated with wine during the season of the dog-star; use it upon a broad compress, and apply above it a pledget and sponge out of wine.—_Another_: Of burnt copper, oz. ij; of fissile alum, oz. ij; of sal ammoniac, dr. ij; of wax, oz. vj; of Colophonian rosin, oz. vj; of myrtle-oil, oz. ij; the dry things are to be triturated in the vinegar in the sun for twenty days, and when it becomes of the consistence of honey, having melted the wax, mix it and soften. The medicine from pumice-stone, the isis, and the like, are also applicable in such cases. * * * * * COMMENTARY. Celsus gives the following list of the more active articles of this class: Crustas ulceribus tanquam igne adustis inducunt, præcipue, chalcitis, utique si cocta est, flos æris, ærugo, auripigmentum, misy, et id quoque magis coctum.