Apparently there are no spontaneous cures of cancer of the bladder. Forber1 reported the average duration of life, presumably from the time of diagnosis, of 33 untreated patients to be 18.8 months, while Welch and Nathanson2 in a series of 28 untreated patients found that 14 had died in fourteen months, 21 had died in thirty months, and 25 had died by the end of five years. The average age of 302 patients of this series was 59.4 years, for which age group statistics compiled by a life insurance company for the general population show a life expectancy of 15.49 years; approximately 88 per cent survive five years. It is obvious, therefore, that untreated cancer of the bladder is a highly fatal disease. Though perhaps not so rapidly lethal as pulmonary and gastric cancer, the situation existing five years after diagnosis is nearly the same. Furthermore, the morbidity