major, with compresses so arranged as to obliterate the sack, if possible. The patient, up to this time, had been slowly losing flesh, and was now very much emaciated. A general typhoid condition existed, the temperature ranging from 101 to 103.5; the pulse from 115 to 135, tongue coated, poor appetite, and in short, the patient in a very critical condition. The use of chloroform, and the shock from the evacuation of the pus, added to the gravity of all the symptoms, and for about two weeks the patient was in great danger of death from asthenia. However, by liberal use of whisky, quinia, beef tea, cod liver oil, etc., he slowly rallied. Two smaller abscesses formed below the knee, but those gave no great anxiety, not so much as some bed sores on the back and hips. The sack or pouch became gradually obliterated, down as far as the knee. The cavity of the joint, however, did not seem to be well drained from the opening in the thigh, notwithstanding it had been kept open freely by tents. About three weeks from this last operation, the sinus or pouch within the knee-joint being so imperfectly drained as above indicated, I made an opening directly into the joint at the outer and posterior part, one inch long, through which I could introduce the probe between the ends of the femur and tibia, without any difficulty, through all parts of the joint. However, I discovered no necrosed bone by so doing. Put a tent into this opening, and let the one above heal up, which it did in about two weeks. This latter opening into the joint I kept open by means of tents until the joint became anchilosed and ceased to discharge pus. The patient made a slow and steady recovery, and about the middle of April was able to get out doors again. The special points of interest in this case seem to be the obscure and insidious mode of attack; the slow progress of the inflammation, it being rather sub-acute than acute; and the fact of its being a sequela of pneumonia. Prof. Gross, in his excellent work on surgery, says, "synovitis, in the great majority of cases, arises from the effects of rheumatism, gout, eruptive fevers, syphilis, scrofula, and the inordinate use of mercury." Prof. Hamilton, in "Principles and Practice of Surgery," says, "synovitis may be caused by exposure to cold, or may occur as a consequence of a rheumatic, strumous, or syphilitic cachexia, as a gonorrhoeal complication, as a sequela of fevers, and from many other causes, whose relation to the disease in question may not always be easily determined." Since there was no local injury to the knee in this case which could have caused the disease, we must seek some other cause for it.