Doot apparently suffered from the intolerable pain that is caused by a bladder stone. Two doctors were attempting to remove a bladder stone from him. Denniston remained in command until he was hospitalised in June 1940 for a bladder stone. Removing the entire bladder stone in one procedure was a great advancement. The use of urinary catheters may cause a bladder stone. In January 1904, he was operated by his sons for a bladder stone. A bladder stone is a stone found in the urinary bladder.