I never observed a fracture of the floor of the acetabulum by a bullet which had entered from the back of the pelvis, although tracks entering by the great sciatic notch were not infrequent. I saw one case in which a bullet which traversed the upper part of the shoulder and emerged at the axilla entered a second time an inch behind and above the anterior superior spine, and split off a layer of the outer table of the ilium of the extent of two square inches, which involved the upper portion of the rim of the acetabulum. No displacement upwards of the femur resulted; but external rotation was accompanied by crepitus. The wound suppurated, and some general infection resulted, but six weeks later there was no evidence of fluid in the hip-joint, the limb was adducted and slightly rotated outwards, and some movement in each direction could be made without causing any great amount of pain. I can say nothing of the further course of this case, as I neglected to take the patient's name. I saw one or two instances of perforation of the sacrum. One is mentioned in the chapter on injuries to the abdomen, in which a central puncture at the level of the fourth vertebra was accompanied by temporary incontinence of faeces. Fractures of the _femur_ were fairly numerous and formed one of the most serious classes of case we had to treat, as well as one of the most fertile sources of mortality in the Base hospitals. In spite of the last observation, however, it is probable that the results in this campaign will be far better than in any previous war, both as to the smaller proportion in which amputation was needed and as to recovery. [Illustration: PLATE XI. Skiagram by H. CATLING. Engraved and Printed by Bale and Danielsson, Ltd. (30) COMMINUTED FRACTURE OF THE SECOND METACARPAL BONE Large fragments of the mantle of the bullet. Fragmentation of the bullet was comparatively common when the metacarpal bones were struck, also free comminution of a somewhat coarser variety than that seen when bones offering greater resistance were struck. This may be a result of the more frequent lateral impact of the bullet on these small bones.]