Weapons, that lodge in the body, are very often troublesome to extract. For there are some difficulties, which arise from their different forms; others from the situation of the parts, into which they have penetrated. Now every weapon is extracted, either on that side, where it entered, or on that, to which it points. In the first case it returns by the way itself made: in the other, it receives one from the knife; for the flesh is cut directly upon the point of the weapon. If the weapon does not lie deep, but is in the surface of the flesh, or at least has not past through large veins and nervous parts, the best method is to pull it out by the way it entered. But if the space, through which the weapon must return, be greater than that, which is to be laid open, and it has already past through veins and nerves, it is more expedient to open what remains, and extract it that way; for it is both nearer at hand, and is drawn out with more safety. And in one of the larger limbs, if the point of the weapon has past beyond the middle of it, it will heal the more readily for being open quite through, as the remedies will act at both extremities of the wound. But if the weapon is to be brought back the same way, the wound must be enlarged, that it may move the more easily, and occasion the less inflammation; which will be considerable, if the body be lacerated by the weapon as it returns. And in like manner, if an opening be made on the opposite part, it ought to be so large, as not to be increased afterwards by the weapon passing through it. In either case, the greatest caution must be used not to cut a tendon, or a large vein, or an artery. When any of these are exposed, it must be laid hold of with a blunt hook, and drawn aside from the knife. When an incision is made large enough, the weapon must be taken out: then also the same method, and the same precaution are to be used, lest any of the abovementioned parts should be injured, which lie under the weapon, that is to be extracted. [Sidenote: _Of arrows._]