Previous to my first publication on ureteral stricture,1in which I emphasized the great importance of ureteral stricture as a disease entity, I had called attention to the probable rôle of focal infections in many of our obscure urinary tract maladies.2In classifying the causes of pyelitis in another paper,3I mentioned ureteral stricture and ureteral calculus as two different factors in the urinary stasis leading to pyelitis. It was not long after beginning intensive work on ureteral stricture that I discovered my error in excluding in my first report those cases of ureteral stricture associated with ureteral stone. I then held the commonly accepted view that the dense scar tissue infiltration generally found encapsulating a ureteral stone was due to the irritation of the stone. One of the first facts that occurs to one who stops to think about the subject is that we occasionally find