For many years we have had at our command five methods of dealing with carcinoma of the urinary bladder. These are fulguration, either trans-uretheral or via suprapubic cystotomy; implantation of radium needles or radon seeds; resection of part of the bladder wall; total cystectomy; external x-ray therapy. Each of these methods has its field of usefulness, and all of them will continue to be employed. Transurethral fulguration of small papillomatous growths of low-grade malignancy will yield, in skilled hands, a high percentage of five-year cures. Since bladder tumors tend to metastasize late, and since the bladder has remarkable power to regain its capacity, resection is a satisfactory procedure for the treatment of those tumors to which it is applicable. Although good results have been reported by some workers, the use of radium and radon implants has not been, in general, very satisfactory. External radiation therapy has been reserved, and properly, for advanced cases which have no prospect of cure by ...