. Radiography and radio-therapeutics . PLATE L.—Malignant Diseases of the Chest. a, Secondary deposits of sarcoma in mediastinum and lungs. b, Lympho-sarcoma of mediastinum, extending outwards from root of lung towards the periphery. c, Secondary deposits of cancer involving mediastinal glands, lung substance, and pleura; thediaphragmatic surfaces of the right lung and the liver are also PLATE LI.—Thorax showing Pleural Effusion and its Absorption. Three plates from the same patient at intervals of several months. a, Plate on anterior aspect of thorax, shows practically a normal con
. Radiography and radio-therapeutics . PLATE L.—Malignant Diseases of the Chest. a, Secondary deposits of sarcoma in mediastinum and lungs. b, Lympho-sarcoma of mediastinum, extending outwards from root of lung towards the periphery. c, Secondary deposits of cancer involving mediastinal glands, lung substance, and pleura; thediaphragmatic surfaces of the right lung and the liver are also PLATE LI.—Thorax showing Pleural Effusion and its Absorption. Three plates from the same patient at intervals of several months. a, Plate on anterior aspect of thorax, shows practically a normal condition. Note level of diaphragmon both sides. b, Effusion at left base. The level of the diaphragm on left side is much higher than in above plate. c, The effusion has been absorbed but the level of the diaphragm remains higher, indicating thepresence of adhesions fixiug the dome of the diaphragm on the left side. TECHNIQUE OF THORACIC EXAMINATION 285 screening. A convenient form of regulator is the Bauer air-valve, a mostingenious method of admitting a small quantity of air into the bulb, thepressure of a small hand-pump forcing it through a mercury valve. Bythis contrivance the operator can regulate the hardness to the requisitedegree without stopping the examination. Experience in the use of the Bauer air-valve for regulation of the vacuumof the X-ray tube leads to the conclusion that
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