Aëtius gives a full and lengthy account of ægilops. He recommends us to attempt the cure first with medicines (see Book Third); and if these do not succeed, he directs us to open the abscess freely, and apply to the fungous flesh medicines possessed of strong stypticity, such as powdered glass, stone alum, and the like. A pledget of lint is to be placed over the medicines. When this method of practice does not succeed, he recommends burning, and for this purpose directs us to make a triangular incision in the flesh, and then to touch the bone with a heated iron, so as to produce exfoliation. Alum with turpentine is then to be applied to the bottom of the sore. (vii, 77.) When the disease does not yield to medicines, Albucasis directs us to open the abscess freely, so as to make an outlet for the matter, and expose the bone. If it is found to be diseased, he recommends us to scrape it with an iron instrument, and then to apply styptic and desiccative medicines to it. When this treatment does not succeed, he directs us to perforate the bone with a triangular instrument of iron. When air issues from the nose by the opening we know, he says, that the operation is completed. For the cure of ægilops, Mesue recommends the removal of all the diseased flesh by means of strong caustics, such as arsenic, sal ammoniac, chalcitis, alum, &c. When the bone is carious, he directs us to scrape off the carious part. Some, he adds, perforate the bone; but the operation had not succeeded well in his hands. He makes mention of the cautery in the same terms as the others. (De Ægr. Oculi, 12.) Jesu Hali approves decidedly of perforating the bone with a specillum, or any suitable instrument. He also speaks favorably of the actual cautery. (De Oculis, ii, 32.) Haly Abbas directs us to lay open the swelling, and apply the cautery. We have mentioned in another place that he was acquainted with the lachrymal duct. (Pract. ix, 29, and ix, 72.) It will be unnecessary to give a particular account of the treatment recommended by Avicenna, as it does not differ from that of Albucasis. According to circumstances he approves of perforating the bone, and of applying the actual cautery to it. He also speaks of introducing a thread into the lachrymal passages and of using injections. (iii, 3, 2, 14.) Avenzoar recommends compression and injections, but does not describe the operation. He speaks of the matter passing into the nose, from which it may be inferred that he also was acquainted with the lachrymal duct. (i, 8, 10.) Rhases likewise makes mention of the lachrymal duct. He recommends us very particularly to make incisions down to the bone, to perforate it, or to apply the actual cautery to it. He makes mention also of escharotic applications containing arsenic, quicklime, and vitriol. He relates a case of apostema lachrymale in which he effected a cure by the ligature and friction. (Contin. ii, 2.)