In cases of hemorrhage from parts, the contrary position to that for sinuses will be the proper one, that is to say, the upright, but that must not be in too great a degree, for there is danger of pain being excited, and of the blood bursting forth from the vessel again; for nothing produces hemorrhage and increases inflammation more than pain. Wherefore apply your finger immediately to the part from which the blood flows, putting it gently upon the orifice of the opening in the vessel, and pressing it so as not to excite pain, for by this means you will restrain the bleeding, and block up the opening with a thrombus, and should the bleeding vessel be deep-seated you will thereby ascertain most correctly its situation and magnitude, and whether it be an artery or a vein. After this, if the vessel be small we must use some of the styptics. The best of these are the obstruents, composed of roasted rosin, of fine flour of wheat, and of gypsum, and such like, mixed up with the white of an egg and applied upon the down of a hare. When the vessel is large seize it with a hook, stretch and twist it moderately. When the bleeding is stopped, endeavour if it is a vein to restrain the blood without a ligature, by the same medicines. But if it is an artery, one of two things must be done, either apply a ligature around it, or cut the vessel asunder, by which means you will restrain the blood. Sometimes, too, we are obliged to apply a ligature to large veins, and also occasionally to cut them asunder transversely. We are sometimes driven to this necessity with regard to veins which arise from a deep-seated place, more especially when they run through a narrow passage or important parts, for thus the portions will be retracted on either side, and the wound will be blocked up and covered by the parts above it. But the safer practice is to do both these things, applying a ligature to the root of the vessel and then dividing it. Having done these things, the wound is to be incarnated as quickly as possible, before the ligature slip from the vessel. For if it is not speedily incarnated, but the emptied portion is dilated, the disease called aneurism is formed. You may know whether it is a vein or an artery that pours forth the blood, from this, that the blood of an artery is brighter and thinner, and is evacuated by pulsations, whereas that of the vein is blacker and without pulsation.