Should the lungs be congested with blood, they must be emptied. This object may be attained either by pressing upon the lower part of the thorax, which will have the effect of forcing the blood out through the nostrils and mouth; or else the diaphragm separating the thoracic cavity from the abdomen may be cut through, and the extravasated blood can therefore be got out through the opening. The injection of the thoracic cavity can also be performed through the same opening. The utmost caution must be used in perforating the diaphragm, as some of the arteries might be wounded by a careless use of the knife. The above operation may be performed before closing the wound in the abdomen or replacing the intestine into the cavity, as it will then leave more room to collect the fluid which may escape from the lungs. The lungs should in all cases be well injected, either through the trachea or by the process given above. The air passages must be carefully stopped with cotton. The mouth being closed, the nostrils are about the only air passages which require the attention of the operator. The eyes, after a few days, are liable to sink in the sockets, which gives the body an unnatural appearance. Mr. John C. Rulon, of Philadelphia, has invented a wax shell, which, after being introduced under the eyelids, prevents the sinking of the eyes. The arterial system is to be injected, and next requires attention. Before commencing to inject the arteries, the jugular vein on the left side of the neck must be punctured so as to allow the blood to escape. In some subjects, the flow of blood will be very copious, in which instance the jugular veins must be opened on both sides of the neck; at other times the flow of blood will be very limited, and even the opening of the veins has sometimes been found quite unnecessary. The femoral artery is the vessel generally chosen for injecting, at a point below the arch about eight inches from and below Poupart’s Ligament. After the artery has been raised, a small incision is punctured into the coat of the artery, large enough to admit the nozzle of the injector, and the canula is carefully pushed upwards into it as far as its length will allow; the artery is then safely and firmly fastened around it, and everything is then ready for injecting. On the mode of injecting depends, in a great measure, the success of the operation. With some of the instruments now employed, the pressure of the injecting fluid is so strong and sudden as in some instances to rupture the walls of the arteries at some weak point, and fill the cavaties of the thorax and abdomen; sometimes even the liquid has been forced in with such force and in such quantities as to burst the arteries, and, after filling the chest, to pour out in a stream from the mouth and nostrils. In the above instances, it stands to reason that neither the arterial nor venous systems have been properly injected.