DERMATOLOGY

or scales, or complicated by pyodermatitis, moist dressings ought to be applied for twenty-four to forty-eight hours, or longer if necessary, either directly or over a layer of zinc paste. All pustules are to be opened, then touched with solution of nitrate of silver. When the diseased area is clean it should be carefully washed with boiled water. If not too sensitive we may employ soap, or pass over it a pledget of cotton-wool moistened with ether. The crude coal-tar is next put thickly on and allowed to dry. This is one of the most important points of the technique, as the longer the layer is permitted to dry the