When the skin adjacent to an ulcer is not united with the parts below, we call such a complaint a sinus. When, therefore, the sinus extends upwards, the ichor readily flows out from the sore, and adhesion easily takes place; but when it extends downwards the ichor by remaining within corrodes the continuous parts, and unless you first make an incision for its discharge, you will be able to effect nothing; for the sores can neither be incarnated nor the parts made to unite. But if the sinus is in any of the limbs, as the arms or legs, one may produce adhesion without a counter-division by putting the limb in a declining position. Thus when the sinus is in the arm, and the mouth of the sore is near the elbow, by placing the hand in an elevated position, you will render the discharge from the ulcer below easy. And when the sinus is in the thigh, and has its outlet near the knee, you must make the position declining by putting a soft pillow below the back part of the knee, so that the groin may be in a lower position than the knee; and if the sinus does not require incarnation, forthwith by means of a straight and hollow pipe having a bladder attached to it, syringe it with honey so diluted with water that one could drink it, in order to clear away the ichor from the sinus. For promoting adhesion when about to take place, do it with wine, or wine and honey, and then proceed to the agglutinating medicine. But if the sinus being hollow requires incarnation, first inject a little of the composition from dried paper with much rose-oil, then plug up the mouth of it with charpie, and afterwards the plaster of iris, or of Machærion, or of some such, may be melted with liquid rose-cerate, and injected in like manner. If the sinus is moderately incarnated you may apply some of the agglutinating medicines, as if you were curing a case of recent bloody wound. Such are those called the barbarous, dichromos, and gilvus; and more especially that prepared from the oil of palma Christi and the metals without wax which is called the dun plaster of Galen, is applicable. After the application of the medicine, a recent sponge out of wine and honey, or wine alone, is to be put on particularly in a soft manner, and the bandaging is to commence at the bottom of the sinus and end at its orifice. The folds of the bandage should bind the bottom of the sinus firmly, yet so as not to occasion pain, but ought to be gradually relaxed towards its orifice; and the plaster which is put on should be so cut as to leave an opening at the orifice for the escape of the matter, but another small plaster of the same materials should be applied to it in a loose state, so as to favour the discharge. This is to be left on till the bandages are loosed, which is to be done on the third day, when they are to be taken off and changed, but the application along the sinus is to be left. You may judge whether the bottom of the sinus