If the axillary is used the operator is able to manipulate but one arm, the one opposite. Raise this arm to right angles with the body then fold down on the chest, exerting an even steady pressure. By raising the arms the blood will leave the hands, and each time pressure is exerted on the chest blood begins to flow from the artery or the vein, and will continue to flow as long as the even pressure is exerted. (3) By the combination of number one and two. The operator opens the artery, preferably the femoral, inserts the arterial tube, and injects a pint of fluid to exert a pressure on the venous system. He then opens the vein, inserts the blood drainage tube which is connected with the blood bottle. With the pump in his right hand (granting that he is using the aspirator and injector pump), he stands at the head of the subject and slowly injects the fluid. If at any time the blood ceases to flow, by taking hold of the hands, raising both arms at right angles to the subject, crossing, and while in this position injecting a few ounces of fluid, then bear down gently on the chest with a steady pressure. If the blood will not flow by this method and the operator is using either the axillary or the femoral, there is hardly any use of trying any other method. The operator will be able to draw the maximum amount of blood with this method, if it is at all possible to draw blood. Often when the blood stops flowing, there is a blood clot formation ahead of the drainage tube. By injecting just a few ounces of fluid or salt water through the tube into the vein, the clot may be pushed to one side, and the blood will continue to flow. =Removal of Blood from the Right Auricle of the Heart. Direct Method.=—Insert the trocar in the third intercostal space, just to the right edge of the sternum or the breastbone. The trocar should be inserted obliquely, the point of the trocar is to pass in the general direction of the left hip joint, while the open end of the trocar is to point in the general direction of the right ear. A general knowledge of the anatomy as far as the location of the heart is absolutely necessary to master this procedure. The object is to have the point of the trocar pierce the right auricle of the heart. When the trocar has pierced the right auricle, which the operator will have to judge through practice, attach rubber tubing to the gooseneck of the blood bottle and by the use of the aspirator pump, draw the blood from the heart into the blood bottle. This is removal of blood by aspiration.