=Treatment.=--A dislocation of one side of the jaw is treated in the same manner as that of both sides. The dislocation may sometimes be reduced by placing a good-sized cork as far back as possible between the back teeth of the upper and lower jaws (on one or both sides, according as the jaw is out of place on one or both sides), and getting the patient to bite down on the cork. This may pry the jaw back into place. The common method is for the operator to protect both thumbs by wrapping bandage about his thumbs, or wearing leather gloves, and then, while an assistant steadies the head, the operator presses downward and backward on the back teeth of the patient on each side of the lower jaw with both thumbs in the patient's mouth, while the chin is grasped beneath by the forefingers of each hand and raised upward. When the jaw slips into place it should be maintained there by a bandage placed around the head under the chin and retained there for a week. During this time the patient should be fed on liquids through a tube, so that it will not be necessary for him to open his mouth to any extent. (See Fig. 29.) =DISLOCATION OF THE SHOULDER.=--This is by far the most common of dislocations in adults, constituting over one-half of all such accidents affecting any of the joints. It is caused by a fall or blow on the upper arm or shoulder, or by falling upon the elbow or outstretched hand. The upper part (or head) of the bone of the arm (humerus) slips downward out of the socket or, in some cases, inward and forward. In either case the general appearance and treatment of the accident are much the same. The shoulder of the injured side loses its fullness and looks flatter in front and on the side. The arm is held with the elbow a few inches away from the side, and the line of the arm is seen to slope inwardly toward the shoulder, as compared with the sound arm. The injured arm cannot be moved much by the patient, although it can be lifted up and away from the side by another person, but cannot be moved so that, with the elbow against the front of the chest, the hand of the injured arm can be laid on the opposite shoulder. Neither can the arm, with the elbow at a right angle, be made to touch the side with the elbow, without causing great pain. =Treatment.=--One of the simplest methods (Stimson's) of reducing this dislocation consists in placing the patient on his injured side on a canvas cot, which should be raised high enough from the floor on chairs, and allowing the injured arm to hang directly downward toward the floor through a hole cut in the cot, the hand not touching the floor. Then a ten-pound weight is attached to the wrist. The gradual pull produced by this means generally brings the shoulder back into place without pain and within six minutes. (Fig. 30.) [Illustration: FIG. 30. TREATING A DISLOCATED SHOULDER. (REFERENCE HANDBOOK.)