This disease consists of the dilatation of a blood-vessel. It may affect arteries in any part of the body. It very frequently occurs in arteries in the interior of the body, in which case little can be done for it in the line of treatment, except what has been recommended elsewhere. When the affected arteries are near the surface of the body, prolonged pressure with the finger upon the artery affected, above the point at which the tumor exists, and ligation of the affected artery, are the most useful measures. A person suffering with aneurism should be prepared to act with promptness, in case of bursting in the sac. Upon the occurrence of such an accident, a pad should be applied over the point of rupture and tightly compressed with a bandage.