The course of the missile was anteroposterior, with high velocity of short range through the bone with a splitting effect, leaving a few fragments, large and small, which were not much displaced and caused but little deformity. Wound was not infected. The absorption of smaller and the overlapping of larger fragments caused some shortening. Treatment, expectant. Results, favorable. [Illustration: Plate 9.] RIFLE--PLATE 9. UPPER EXTREMITY. Gunshot Fracture of the Right Humerus, with Lodgment of the Missile. Wound of entrance, antero-external aspect of upper third of arm. Wound of exit, none. The missile, deformed by ricochet, struck the bone with greatly reduced velocity and without sufficient energy to perforate the bone by which it was deflected slightly from its course and lodged in the arm. This is something of the same effect that might have been caused by a shrapnel ball, under the same ballistic conditions with a normal shrapnel velocity giving about the same penetrating force. The wound, without infection, is in the first week or two of repair, before any callus has formed. Treatment is expectant. Results favorable. [Illustration: Plate 10.] RIFLE--PLATE 10. UPPER EXTREMITY. Gunshot Fracture of the Left Humerus, with Lodgment of the Missile. Wound of entrance, anterior surface of upper third of the arm. Wound of exit, none. The shadow of the missile shows by its distinct outline and normal diameter at the tip that the missile lies on the side near the plate; the shortened length of the projectile indicates that the long axis lay in an acute angle with a perpendicular to the plate. The irregular outline of the base of the shadow and the fact of lodgment shows that the missile was deformed and that it was incidentally retarded in velocity by ricochet, so that its penetrating force was not sufficient to carry it through the arm. The fragments of bone are large and the wound is of the same character as might have resulted from a shrapnel ball, for the normal ballistic conditions of the latter simulate the conditions that produced the wound. The drainage tubes seen in the plate indicate infection. The conventional treatment in such cases is drainage and other management of the infection without formal search for the projectile. Results should be favorable. [Illustration: Plate 11.] RIFLE--PLATE 11. UPPER EXTREMITY. Gunshot Fracture of the Humerus. Wound of entrance, anterior internal aspect of middle and upper third of arm. Wound of exit, opposite. The missile has struck the side of the bone and pursued a course through the shaft, so that a transverse fracture, as well as the separation of several medium-sized fragments, resulted from the splitting effect of the missile. A larger missile, i. e., a shrapnel ball, with the same striking energy could have been stopped by the bone, but a wider distribution of the same energy carried by a larger cross section would have produced larger fragments.