To the Editor: —In reference to diverticulum of the bladder in the inguinal canal, described by Dr. Stein inThe Journal, March 3, it is interesting to note that in the surgical literature of one hundred years ago, frequent mention is made of inguinal cystocele. Samuel Cooper of London, in his Surgical Treatise (First Lines of Practice of Surgery with Notes, by Alexander H. Stevens, M.D., Vol. 2, New York, James V. Seaman, 1822), discusses at considerable length "Cystocele or Hernia of the Bladder." He writes: "The protrusion of the bladder at the abdominal ring is the most frequent. It is generally seen in male subjects, a large proportion of whom are considerably advanced in life, and have been repeatedly afflicted with retention of urine." As the author advises waiting until the fourth day to relieve, by operative procedures, complete retention of urine when catheterization is impossible, stating this to