Alum dissolved in water and applied, or rectified spirit of wine, will prevent the blistering of a flight burn. Or hold the part before the fire; or apply raw onions, soap and oil beaten together for a poultice. When a burn is bli-stered, it is not to be cut, but must be treated with emollients; or soap and oil, or with the saturnine ointment. When the burn is so deep as to cause a gangrene, it must be scarified and treated with emollients; as also warm fomentations and poultices. When the eschar is cast off, it must be cured as a wound or ulcer. In all considerable burns, the patient must bleed, take cooling purges, such as the lenitive electuary, or Epsom salt; and drink plentifully of thin liquors.