Albucasis states that there are four modes of curing trichiasis. 1. By the actual cautery. 2. By the potential cautery. 3. By incision and the suture, which operation he describes at great length. He directs us in the first place to evert the eyelid, either by taking hold of the ciliary hairs, or by passing a needle, armed with a hair, through the tarsus, and raising the eyelid with it. He then, like the others, directs us to make the under-incision within the ciliary hairs, from the greater canthus to the smaller, to cut out the redundant skin of the eyelid, and unite the surfaces with sutures. In short, his operation is exactly the same as our author’s. He mentions, however, another method of making the incision by elevating the redundant fold of the skin with hooks or a trident, and cutting it off with a pair of scissors. 4. The fourth method consists of making the under-incision, as in the last operation, and then twisting the redundant skin firmly about reeds or small pieces of wood until it mortifies: after which the wound is to be cured upon general principles. Serapion’s account of the operation is defective, and need not be particularly noticed. Canamasuli directs us to cut out the hairs and burn the part with a cautery of gold. Avicenna merely mentions, in very general terms, that the cure may be accomplished by agglutinative applications, by the cautery, or by excision. Mesue briefly describes four modes of cure: 1. By means of agglutinants. 2. By passing a needle, armed with a hair, through the tarsus, as will be explained in the 13th section. 3. By plucking out the hairs and cauterising the part. 4. By applying medicines calculated to prevent the renewal of the hairs after they have been plucked out. Jesu Hali’s description of these operations is very circumstantial; he speaks of cutting out the piece of skin with a fine pair of scissors. Rhases states that the cure of trichiasis may be effected by burning the roots of the hairs with a red-hot needle, or by making the excision of the superfluous skin of the eyelid. He also makes mention of the treatment by agglutinants. In his great work, the ‘Continens,’ he briefly notices the four operations described by Albucasis. He appears to have approved very much of the burning. He also describes the operation with the reeds or pieces of wood. Avenzoar mentions four methods of curing inversion of the ciliary hairs. 1. By everting the upper eyelid and securing it with agglutinants until the roots of the hairs have been cauterised with a rod of gold. This method he does not approve of. 2. By extirpating the offending hairs and applying the blood of a bat to the places from which they were torn. 3. By making an excision of the superfluous skin of the eyelid, and afterwards applying sutures. He alludes, we suppose, to the operation of Aëtius. 4. By twisting the skin about small reeds or tubes, in the manner described by our author and Albucasis.