COMMENTARY. We will give Celsus’s description of this operation in his own words: “Quidam aiunt, acu transui juxta pilos exteriorem partem palpebræ debere, eamque transmitti duplicem capillum muliebrem ducentem, atque ubi acus transiit, in ipsius capilli sinum, qua duplicatur, pilum esse conjiciendum, et per eum in superiorem palpebræ partem attrahendum, ibique corpori agglutinandum, et imponendum medicamentum quo foramen glutinetur; sic enim fore, ut is pilus in exteriorem partem postea spectet.” However, he does not much approve of the operation. He also describes the operation of cauterising the roots of the hairs. (vii, 7.) Albucasis, Haly Abbas, and Rhases describe the operation in much the same terms as Celsus and our author. Most of the Arabian authorities, likewise, describe the operation of burning the roots of the hairs by means of a specillum or any such instrument. Canamusali gives a short account of both operations, that is to say, the anabrochismus and burning the roots of the hairs. This operation is described by the earlier of the modern writers on surgery. The agglutinative composition recommended for this purpose by Guido de Cauliaco consists of mastich, frankincense, aloes, sarcocol, and tragacanth, dissolved in the white of an egg. (vi, ii.) SECT. XIV.—ON HYDATIDS. The hydatid is a fatty substance, naturally lodged under the skin of the eyelid, which, in some persons, more especially in children of a more humid temperament, increases until it become the cause of disagreeable symptoms by encumbering the eye, and thereby occasioning defluxions. The eyelids, therefore, under the brows appear watery and cannot be raised in a becoming manner; and if, when we press upon them with our fingers, we separate the fingers, the intermediate space swells up. They are most troubled with defluxions about day-break, and cannot look direct against the rays of the sun, but shed tears and are subject to continued ophthalmies. Wherefore, having placed the patient in a proper position, we compress the eyelid with the index and middle fingers a little separated from one another, so as to form a collection of the watery contents between the fingers, and direct the assistant, who stands behind and holds the head, to stretch the eyelid moderately at the middle of the brow; then taking a lancet used for bleeding, we make a transverse incision through the middle, not longer than that made in venesection, and of such a depth as to divide the skin or even to touch the hydatid itself; but this is to be done with due circumspection. For many plunging the instrument too deep, have either divided the cornea or wounded some muscle of the eyelid. If the hydatid immediately appear, we draw it out, or if not, we again make a slight incision. When it comes in sight we seize on it by the fingers, with a soft cloth, and moving it hither and thither and round about, we draw it out. After the removal of