The skin and muscles are now stripped from the thoracic wall on both sides of the median incision, beginning first on the right. (See Fig. 36.) The right flap of the abdominal wall is taken in the left hand just above the umbilicus and turned over the right lower border of the ribs, and pulled forcibly upward and outward to the right, putting the peritoneum, the ligamentum teres of the liver and abdominal muscles upon a stretch over the edge of the ribs. These are then cut by the cartilage-knife in an incision extending from the median line along the edge of the ribs deep down into the flank. The loosened flap of skin and muscle is then pulled over to the right with the left hand, while the right hand holds the cartilage-knife, with its cutting edge turned obliquely to the surface of the ribs, and makes long, sweeping cuts from above downward, severing the thoracic muscles and fascia as closely as possible to the costal cartilages and ribs. The skin and muscles are thus stripped off from below upward until the right side is laid bare as far back as the anterior axillary line and to the middle of the clavicle above. (See Fig. 36.) In stripping the muscles from the ribs it is necessary only to do it sufficiently to show the costal cartilages and their articulations with the ribs. Too clean dissecting is not necessary. On the other hand, careless slashing cuts should be avoided, as they might cut through into the pleural cavity. The right mammary gland is next examined. The index-finger of the left hand is put upon the nipple, the skin-flap turned over, and an incision made from the inner surface, extending through the gland to the nipple. Parallel incisions may then be made. The axillary glands may be examined by carrying the skin and muscle flap farther down into the axilla. The thoracic wall is then laid bare on the left side, in exactly the same way as on the right, except that the right hand works underneath the left, as the latter pulls the flap over to the left. When the left side is stripped, the left mamma is examined in the same way as the right.