The description of the operation given by Aëtius from Leonidas being nearly the same as that described by our author, we shall confine ourselves to an abridged account of it, and merely make a few remarks to illustrate the description of Paulus. In order to facilitate the operation, he recommends the operator to have two assistants instead of one, as directed by our author. He also recommends him, in the first place, to mark with ink the portion of skin which requires to be cut out. He then directs him to make the under-incision, by which he seems to have meant an incision within the ciliary hairs along the tarsus, and extending from canthus to canthus. He recommends it to be made pretty deep, and even in certain cases suggests the propriety of making two under-incisions, one as above described within the ciliary hairs, in order to relax the tarsus; and the other upon the preternatural hairs. He next directs first a transverse incision to be made along the eyelid above the ciliary hairs, and then a lunated one beginning and ending like the other, after which the skin, thus separated, is to be dissected out. He recommends the edges to be united by means of five sutures, one in the middle and two at each extremity of the incisions. The other steps of the operation are exactly the same as those described by our author, and cannot be misunderstood. Hippocrates describes an operation for trichiasis, which Heister thought the same as that recommended by Aëtius, but the description is so obscure that we must confess our inability to explain it. Celsus describes three methods of cure for trichiasis. 1. By burning the roots of the hairs. 2. The anabrochismus, which will be explained in the 13th section. 3. The anarrhaphè or suture, as described by Aëtius and our author. As the steps of the operation described by him are almost exactly the same as those of Aëtius, we need not dwell upon the explanation of them. Lest, however, there should be any misapprehension about the under-incision, we shall give his directions about it in his own language: “præter hoc, in superiore palpebrâ sub pilis ipsis incidenda linea est ut ab inferiore parte diducti pili sursum spectant; idque si levis inclinatio est, solum satis est.” Instead of five sutures, as directed by Aëtius, he recommends only three.