Albucasis directs us, in the first place, to prick the tumour, in order to ascertain the nature of its contents. When they are found to be fatty, he recommends us to cut it out by making a crucial incision, and removing it with its cyst if possible. When the cyst is wounded he directs us to dissect it out in pieces, and to endeavour to leave no part of it behind. He gives drawings of various instruments, namely, scalpels, tenacula, and perforators, for dissecting out these tumours. (ii, 45, 46.) Rhases and Avicenna give very judicious directions for the treatment of these tumours, but they scarcely differ at all from those of Aëtius and our author. They recommend us to avoid opening the cysts of the atheroma and meliceris, if possible; but if any part remain they direct us to destroy it by septics. (Contin. xxvii.) SECT. XXXVII.—ON ANEURISM. Aneurism is a tumour soft to the touch and yielding to the fingers, having its origin from blood and spirits. Galen says “an artery having become anastomosed (i. e. dilated) the affection is called an aneurism; it arises also from a wound of the same, when the skin that lies over it is cicatrized, but the wound in the artery remains, and neither unites nor is blocked up by flesh. Such affections are recognised by the pulsation of arteries; but, if compressed, the tumour disappears in so far, the substance which forms it returning back into the arteries.” Thus Galen.—But we distinguish them from one another in this way: That formed from anastomosis of an artery appears longer, is deep seated, and when pressed upon by the fingers, a sort of sound is heard; whereas no noise is heard in the cases arising from rupture, and these, moreover, are more rounded, and feel superficial. Those therefore which form in the armpits, groin, and neck, and those in other parts of the body, which are very large, we must decline operating upon, on account of the largeness of the vessels. But those which occur in the extremities, the limbs, or the head, we operate upon thus. We make a straight longitudinal incision in the skin, and then having separated the lips with hooks, as we mentioned in the operation of angiology, and having dissected away the skin, and separated it with the instruments used for operations on membranes, we lay bare the artery, and passing a needle under it, and tying it with two ligatures, and having first divided the intermediate part of the artery with a lancet used for bleeding, and evacuated its contents, we have recourse to the suppurative treatment until the falling off of the ligatures. If the aneurism be occasioned by rupture of the artery, we must seize in the fingers along with the skin as much as possible of the aneurism, and then below what we hold in our hand we push a needle having a double thread, and after it has passed through we cut the double, and thus with the two threads we bind the tumour on this side and on that, as we mentioned for staphyloma.