In cystoscopy we have a means of exact diagnosis which is not generally utilized. In the male the electric cystoscope is used, while in the female we may use either the electric or the open-air method, the technic of which I shall briefly describe. I use, in women, exclusively the Kelly air-cystoscope, not because better results are obtained by it, but because, (1) its simplicity and (2) because, as an assistant to Kelly for a number of years, I am far more familiar with that method.
The external urethral orifice is thoroughly cleansed with boric acid solution, the patient then catheterized, and the catheterized specimen of urine saved in a sterile vessel for microscopic, chemical and bacteriologic examination if desired. A sterilized medicine dropper is then filled with 10 per cent. cocain which is injected into the urethra. The patient is then placed in the knee-chest position, and the urethra