Miss B. aged 23, had a slight scratch on the inside of the index finger, which issued in severe inflammation extending over the back of the hand. I made a free incision in the part first affected, evacuated a little pus, and directed a poultice to be applied. On the following day, there was less pain but still great swelling at the back of the hand, which, I think, would have been removed had the caustic been used. I now applied the caustic freely within the orifice. On the following day there was less swelling and discharge. Two days afterwards, the caustic was again applied, and in eight days from the first application of the caustic the hand was quite well. 3. _Of Fungous Ulcer of the Navel in Infants._ It sometimes occurs that a little fungous sore exists upon the navel in infants which is difficult of cure in the ordinary way. I had one case which had subsisted for two years, and another, which had continued for two months, and were, during those periods, a source of great trouble and uneasiness to the mothers of the little patients. These ulcers are easily cured in the following manner. The fungus is to be completely removed by a pair of scissors, and when the bleeding has quite ceased, the lunar caustic is to be applied, and the part defended by the gold-beater's skin and kept carefully from any moisture. In one of the cases mentioned above the eschar was accidentally separated twice and required to be renewed; but both cases were cured in the space of a few days. 4. _Of Inflammation of the Knee._ Servant women, I suspect from much kneeling in scouring stairs, &c. are subject to a species of inflammation of the knee which is frequently extremely troublesome. In one case suppuration of the integuments took place in the forepart of the knee, and the patient was obliged to leave her situation and go to her friends at a distance, although every antiphlogistic means was tried for her relief. In two other cases, after the application of twenty leeches and the administration of an emetic and purgative medicine, I applied the lunar caustic freely over the whole surface of the knee previously moistened with water. In a few hours the cuticle was raised and vesicated; I evacuated a viscid puriform fluid, and I directed the constant application of the cold poultice and lotion. In a few days all inflammation subsided and the patients remained well. These three cases having occurred to me at the same time, and being apparently equally severe, I was enabled to judge of the efficacy of this use of the caustic, and I can strongly recommend it to a future and further trial. Its application causes more pain than a blister, but not so much as to form an obstacle to its employment. It may not be unimportant, here, to suggest the trial of the caustic in other cases of inflammation, in which a more than usually active local remedy is required. 5. _Of Tinea Capitis, &c._