39. For the most part the displacements of these bones are small, sometimes toward the ribs, and sometimes to the outside; and the whole articulation is not displaced, but that part of the humerus remains in place which is articulated with the cavity of the bone of the forearm that has a protuberance (ulna?). Such dislocations, to whatever side, are easily reduced, and the extension is to be made in the line of the arm, one person making extension at the wrist, and another grasping the armpit, while a third, applying the palm of his hand to the part of the joint which is displaced, pushes it inward ward, and at the same time makes counterpressure on the opposite side near the joint with the other hand.