But there is an additional difficulty attending every wound, where the weapon is either fixed in a bone, or has sunk into an articulation between two bones. If, in a bone, the weapon must be moved to and fro, till the part, which gripes the point, gives way, and then the weapon must be extracted, either with the hand, or a forceps. Which is also the method of extracting the teeth. And it is very rare that the weapon does not follow in this way. But if it still remains, it may be forced out with some kind of instrument. The last resource, when it is not extracted, is to make a perforation near it by a terebra, and from that opening, to cut the bone in the form of the letter v, opposite to the weapon, in such a manner, that the opening of the lines be directed towards the weapon; when this is done, it must necessarily give way, and be easily taken out. If it has made its way into an articulation between two bones, the two limbs must be bound up with rollers and straps, and by means of these drawn contrary ways, to stretch the tendons: which being extended, will leave a larger space between the bones, so that the weapon may be extracted without difficulty. Care must be taken, as I observed in other cases, in its extraction, that no nerve, vein, or artery be wounded by the weapon, whilst it is extracting, _which is to be guarded against_ by the method mentioned before. [Sidenote: _Of poisonous weapons._] But if a person be wounded by a poisoned weapon, all that is above mentioned being, if possible, still more expeditiously executed, he must also be treated in the method prescribed for one that has drunk poison, or been bit by a serpent. The treatment of the wound itself, after the extraction of the weapon, is the same as if nothing had been lodged there; of which I have said enough elsewhere. CHAP. VI. OF A GANGLION, MELICERIS, ATHEROMA, STEATOMA, AND OTHER TUBERCLES OF THE HEAD.