2. One or both ureters have been cut or completely divided with scissors, or knife, in removal of the uterus. 3. A segment of a ureter 7 centimetres in length has been accidentally exsected. 4. One or both ureters have been compressed by clamps applied to restrain bleeding in the course of vaginal hysterectomy, and subsequently sloughed. 5. Ureters exposed in the course of ‘radical’ operations for cancer of the neck of the uterus often slough. 6. A ureter is sometimes transfixed by a needle and thread when sewing the layers of the broad ligament together in the course of a subtotal hysterectomy. The most dangerous injury to the ureters occurs in the course of a subtotal hysterectomy, especially if it is not recognized at the time of the operation. In such circumstances the urine will slowly leak into the connective tissue of the broad ligament and form an extravasation extending into the loin. In some cases the fluid will leak directly into the pelvis, and a sinus will form in the abdominal wound and allow the urine to escape; this may be the first intimation that a ureter has been injured, whereas when a ureter has sustained damage in the course of a total abdominal or a vaginal hysterectomy, the leakage of urine along the vagina will quickly apprise the surgeon of the accident. There is another form of injury to the ureter which should be mentioned. Occasionally a fibroid, but more often a cyst or tumour arising from the base of the broad ligament, will involve the corresponding ureter and carry it upwards in such a way that, when the layers of the broad ligament are reflected, the ureter will be found crossing the crown of the tumour like a strap. In such a case the pressure has usually exerted a banal influence on the kidney, and it is often in the condition known as sacculation. In a case under my own care in which I attempted to remove a malignant tumour of the broad ligament, and in which the ureter ran over its upper pole in this way, thinking it was an adhesion, traction was made upon it, and the ureter came away with a portion of the renal pelvis. At the post-mortem examination the kidney was merely a thin-walled sac with purulent contents. In all cases in the course of an abdominal hysterectomy it is useful for the surgeon to inform himself of the condition of the kidneys. Whilst performing a subtotal hysterectomy, one of the fibroids burrowed deeply between the layers of the left broad ligament; when all the bleeding was checked, I looked carefully to determine that the ureter was safe, and found it kinked by the ligature applied to the corresponding uterine artery; it was at once removed. On palpating the kidneys I found the right kidney small, and shrunken, and useless. Fortunately the woman recovered.