Therapy with ultraviolet rays from a quartz mercury vapor arc lamp has for a long time been an important part of treatment of postoperative and inoperable genito-urinary tuberculosis. The older type of air-cooled quartz mercury vapor arc lamp, also the newer more powerful variety, and the water-cooled quartz mercury vapor arc lamp have been utilized. The air-cooled lamp is almost a specific in the healing of sinuses following nephrectomy and epididymectomy for tuberculosis. Similar exposures over the regions of the bladder and kidneys at regular intervals over long periods are given as a routine in the treatment of urinary tuberculosis. Since therapy of this kind has been useful externally it is reasonable to think that it might have a good effect in the bladder if it could be suitably applied. However, we have not been able to employ it satisfactorily until recently.
Caulk and Ewerhardt1 reported treatment by direct