For a time after its modern introduction, a few years ago, the treatment of various chronic diseases of the joints by means of hot air enjoyed quite a considerable vogue. As time went on, however, the novelty subsided, and the method has almost fallen into innocuous desuetude. A number of persistent investigators have, however, continued its employment with highly satisfactory results, and the report of the observations, with the exhibition of the patient, made at a recent meeting of the Philadelphia County Medical Society, by Dr. Henry Tucker, should at least revive interest in the subject. The patient was a young woman, perhaps 25 years of age, who presented marked and wide-spread lesions of rheumatoid arthritis, and in whom improvement, that can in moderation be designated "remarkable," was effected after three months' treatment, forty-five exposures in all, at temperatures of 240 to 270 F., being made. It is not alone