COMMENTARY. Hippocrates in his ‘Prognostics’ has stated the danger of an erysipelas being translated to an internal part. He also states that gangrene supervening upon erysipelas is dangerous. He has not, however, given any very particular account of the disease. In one of his aphorisms he states that cold is useful in erysipelas when not ulcerated, but prejudicial when it is ulcerated. His commentators, Theophilus and Damascius, confirm this statement. (Scholia in Hip. et Galen, ii, 456). Celsus recommends bleeding if the strength permit, and then repellent and refrigerant applications, especially ceruse with the juice of solanum (nightshade), or Cimolian earth with river water, and the like. When refrigerants fail to produce the effect, sulphur, ceruse, and saffron are to be pounded with wine and applied. If the part become putrid he directs us to use corrosive applications or the actual cautery. Afterwards the sore is to be cleansed with honey and rosin, and treated upon general principles. We have stated in the preceding Section that the ignis sacer of Scribonius Largus is not herpes. That it was erysipelas seems probable from the similarity between his applications for it and those which Celsus and the other authorities recommend for erysipelas. Thus for ignis sacer he recommends Cimolian chalk, diluted with the juice of solanum, or the solanum by itself, or with bread; or a mixture of sulphur vivum, ceruse, and litharge. We may remark further in this place that the _ignis sacer_, or St. Anthony’s fire of the middle ages, would appear to have been some variety of erysipelas.