When the abscess has been deeply seated, and the incision made through a considerable thickness of healthy parts, it is sometimes, though very rarely, necessary to introduce a small piece of lint between the edges of the wound, otherwise they may speedily adhere, and the discharge of the matter be in this way prevented. In consequence of smart hemorrhage, also, it may be proper to stuff the wound with lint, and retain it for an hour or two; but in general the practice of stuffing abscesses, or the openings into them, is hurtful. After the incision, as already remarked, it is unnecessary and injurious to discharge the pus by forcibly squeezing the sides of the abscess; the application of a poultice will promote the evacuation of the matter, and allay the irritation. In chronic abscesses of large size, it is sometimes necessary to make a counter opening—that is, an opening in a part of the tumour opposite to the original opening, in order that the matter may be more completely discharged. Setons introduced into the cavity of phlegmonous abscesses some time after their evacuation, are highly injurious, as causing much irritation in parts which are already in a morbid state of excitement; but in chronic collections, which show no disposition to heal, their use may sometimes be followed by good effects, on the same principle that they were hurtful in the preceding case; if they should not cause a sufficient degree of excitement, they may be smeared with some stimulating ointment. In extensive collections, in which the matter is not sufficiently evacuated by the external aperture, injections are by some recommended, and, perhaps, occasionally employed: in those abscesses which are comparatively recent, and in which the surrounding parts are still in a state of over-excitement, they are quite inadmissible. The employment of setons and injections in any case of abscess is not much to be commended or trusted to. Caustic, the potassa fusa, may be frequently employed with advantage for opening chronic abscesses, especially when they are the consequence of glandular enlargement, and undermine the integuments, which show no tendency to adhere to the subjacent parts. The potass is best used in the solid form and well pointed; not in paste, as is sometimes practised. By its application the unhealthy surface is destroyed, and the surrounding parts are stimulated so as to assume a sufficient degree of action to throw off the portions which have become useless, and to form new and healthy granulations, whilst the surrounding effusion of lymph or serum is for the most part speedily absorbed. But it can never be employed in acute abscesses without aggravating the disease; and in collections which are deeply seated, it cannot be of much service, for in these a considerable thickness of healthy parts must be destroyed, and if the potass be applied, it will afterwards be necessary to cut through the slough, as was practised by