is laid bare, we stretch it with hooks and remove it with a sword-shaped cautery. * * * * * COMMENTARY. Celsus directs the surgeon, when water is contained in a hernial tumour, to make an incision in the groin, if the patient be a child, unless the largeness of the collection prevent; but in adults, and when the swelling is great, he recommends him to make it in the scrotum. Then if the incision be in the groin, the coats are to be drawn up there and the water discharged; but if in the scrotum, and if the disease be seated there, nothing more is to be done but to evacuate the fluid, and remove any membranes which may happen to contain it; after which the parts are to be washed with a solution of salt or soda. When the fluid is situated under the middle or inner coat (the tunica vaginalis and tunica albuginea?), all these tunics are to be removed without the scrotum and cut out. (vii, 21.) Celsus, as well as our author, describes the hæmatocele or bloody tumour, the existence of which is affirmed by Heister. (ii, 5, 123.) Galen alludes incidentally to the evacuation of the fluid in hydrocele. (Meth. Med. xiv.) Sprengel and Guy de Cauliac affirm that he makes mention of the seton as a mode of cure; but if this assertion be correct we have not been able to find out the passage in which he does so. Aëtius gives a very distinct account of the nature of hydrocele, but his description of the operation is by no means so accurate as our author’s. He trusts mostly to astringent and desiccative applications. (xiv, 22.) Albucasis describes the operation in nearly the same terms as Paulus. His operation consisted of making an incision in the swelling and dissecting out the coats of the testicles. The dressings which he recommends are similar to those mentioned by our author. He also describes the operation by the cautery in nearly the same terms as Paulus. He adds, that if the patient be timid and do not choose to submit to these operations, the surgeon may let out the water either with a scalpel or the instrument used for tapping in dropsy. He states, however, that after this operation the water will collect again. (Chirurg. ii, 62.) Avicenna briefly describes the operation of opening the tumour, and applying cauteries or strong medicines to the membranes. (iii, xxii, i, 6.) Haly Abbas directs us to open the tumour, and cut out its tunics, and then to apply incarnative dressings. This treatment, he adds, the moderns prefer to the escharotic applications used by the ancients. (Pract. ix, 47.) He also describes the process of burning. (Pract. ix, 79.) Rhases describes the operation of puncturing the scrotum for hydrocele. He also speaks of burning the part with a slender rod of iron, and of cutting out its tunics. (Cont. xxiv.)