While these were making in a forcible manner, the head was perceived to approach by degrees towards the glenoid cavity, near to the edge of which it reached in two minutes, and was at length replaced, by a sudden movement of the limb from behind forward. Scarcely was the reduction accomplished, when a tumour rose suddenly under the pectoralis major, propagated itself towards the arm-pit, and occupied immediately its whole extent. All the assistants, astonished at the phenomenon, knew not to what circumstance to attribute it. Desault himself, a little embarrassed, thought first of an aneurism suddenly produced by the violence of the extension. The pulse of the patient, being scarcely perceptible in the side affected, and a syncope which supervened, appeared at first to favour this suspicion: but immediately the absence of a fluctuation, of a pulsation, and of a change in the colour of the skin, the return of the pulse, the circumscription of the tumour, its resistance, and the sound caused by striking on it, produced a belief that it was owing, not to an effusion of blood, but to a disengagement of air that had been confined in the now lacerated cells of the cellular membrane. Over the whole of the swelling were applied compresses wet with vegeto-mineral water, while a regular compression was made on it by means of a bandage, which, at the same time, kept the arm fixed against the trunk. In the night there occurred severe pains around the articulation and the tumour, accompanied with high fever, both which symptoms disappeared on the following day. Third day, a diminution of the emphysematous swelling; and an entire cessation of fever and pain. Eighth day, tumour reduced to half its original size; the arm made to perform gentle motions, and disengaged from the apparatus; discutients continued. Thirteenth day, tumour entirely gone. In the place which it had occupied a large echymosis appeared, produced no doubt, by a rupture of the small vessels at the time of reduction, but which, till now, had not been perceptible externally, in consequence of the emphysematous swelling of the parts, and which was treated by the same means as the emphysema. Seventeenth day, a yellow tinge, mixed with the colour of the echymosis, an evidence of its resolution, which was complete by the twenty-seventh day. During all this time, the patient had accustomed his limb to constant motion; a facility in the movement of it had thereby returned; and he was perfectly well when he left the Hotel-Dieu, on the thirtieth day from the time of his admission, and the sixty-fifth from the occurrence of the accident. MEMOIR VIII. ON THE FRACTURE OF THE BONES OF THE FORE-ARM. § I.