In this case which is now reported there was no evidence of strain and no urinary infection, stricture, or abnormality of the urethra to cause bladder distension, and apparently the patient did not strain to micturate since she was walking home. It must be considered to be a spontaneous rupture of a normal bladder.The obvious criticism of the investigation is that on Oct. 24, the day after admission, whenonly 2 02. of urine were withdrawn by catheter, the return of a measured quantity of fluid introduced into the bladder should have been estimated.This case is reported as a true non-pathological spontaneous rupture of the bladder.