Each bone offered some special features dependent on its structural character and anatomical position. In the case of the _ulna_, pure perforation of the olecranon process, without obvious evidence of implication of the elbow, was seen on several occasions. The other important feature with regard to this bone depends on its subcutaneous position, which accounted for the frequency with which highly developed explosive exit wounds were met with. One is figured in the general section (fig. 47, p. 156). This, however, is a very slight instance compared with what was often seen in the upper and middle thirds of the bone, where the lateral soft parts often protruded as a much larger tumour, the particular illustration being mainly designed to show the nature of the injury to the skin. The _radius_, as more deeply placed in the upper part of its course, was less often the seat of such well-marked explosive injuries; but when the lower end was struck this character was sometimes very striking: thus in a track passing antero-posteriorly through this bone, the whole lower end appeared shattered, all the tendons at the back of the wrist being implicated in the protruding mass, while the bone itself seemed shortened, so that the hand took up the position common in Colles's fracture. It was found impossible to place the bone in good position; nevertheless the patient retained his hand, which is still of use in writing. Plate X. is a good example of a high-velocity injury in which lateral contact with the radius has produced local comminution, some slight injury to the casing of the bullet, and the separation of a large wedge. The case from which this was taken also illustrated well one of the chief troubles of such fractures of the forearm; the degree of splintering resulted in the formation of a large mass of callus, which for a time rendered any degree of pronation and supination impossible. [Illustration: PLATE VI. Skiagram by H. CATLING. Engraved and Printed by Bale and Danielsson, Ltd. (26) COMMINUTED FRACTURE OF THE HUMERUS Range '250 yards.' Impact oblique. Wound of entry 1 inch below the insertion of the deltoid; exit, on inner aspect of arm at a slightly lower level. The bullet probably struck the bone laterally, and drove out the central fragment. Prolonged suppuration resulted, but the humerus healed well, and good movement of the elbow was preserved. The effect of oblique impact together with high velocity is well illustrated. Had the resistance been greater, as in the case of the femur, a nearer resemblance to the effect seen in plate XV. would have been the result.]