auricular appendage, cutting the left aortic flap. If it is desired to save the cusps the pulmonary artery may be dissected from the aorta and the incision carried between the right posterior and the anterior valve-flaps. The heart is again rotated toward the right and the mitral ring is cut with the enterotome, which is introduced from the left auricle into the left ventricle. The left auricular appendage is then cut open. The heart-wall is then examined by means of parallel vertical or horizontal incisions. The papillary muscles are cut longitudinally from apex to base. The coronary vessels and their branches are then examined, partly from the aorta and partly from the incisions through the muscle. =Prausnitz Method.= The heart is removed and held in the palm of the left hand and two vertical incisions are made on either side of the septum, parallel with it, and extending from base to apex. Two other incisions are then made from base to apex on the outer borders of the ventricles, connecting at the apex with the first incisions. The ventricles are opened by the triangular flaps of the anterior wall thus formed, these flaps being attached at the base of the heart. The contents of the cavities are examined and removed; the valvular orifices and flaps are examined, and the pulmonary and aortic rings are cut through with the shears by extending the two incisions made on each side of the septum, taking care to pass between the cusps. The heart can also be opened with the long shears alone. The openings of the two cavæ in the right auricle are connected by an incision. The auricular appendage is opened by a second cut. The shears are then put through the tricuspid ring, and this with the right ventricle is cut, the incision following the right ventricular border. The pulmonary orifice is then opened by a cut made along the right side of the septum. The left heart is opened through the pulmonary veins, cutting first the auricle-wall, then the mitral ring and ventricular wall to the apex. An incision is then made along the left side of the septum, through the aortic orifice into the aorta.