_Treatment._—To prevent the formation of blisters on the posterior surface of the thorax, aspirate the serous fluid from the pleural sacs, introducing the trocar through the apex of the cavity, and extending it into the cavity until it has almost reached the diaphragm. This must be done with both the right and left sacs. Give the body a complete injection, using normal fluid throughout the entire injection. Inject the pleural sacs after the serous fluid has been withdrawn. For prevention of post-operative dangers such as bursting blisters, etc., line the casket with rubber for a distance of 3 inches above the bottom. For transportation of these cases, govern yourself according to the provisions of the transportation laws. CHAPTER XXI. TREATMENT OF SPECIAL DISEASES.—Continued. DISEASES OF THE CIRCULATORY SYSTEM. =Pericarditis.=—_Definition._—An acute inflammation of the pericardium and the serous covering of the heart. _Treatment._—Give the body a thorough injection of half strength fluid followed by normal fluid. Drain from the veins. Inject the abdominal cavity. For transportation of these cases, govern yourself according to the provisions of the transportation rules. =Hydropericardium.=—_Synonym._—Dropsy of the pericardium. _Definition._—Hydropericardium is a non-inflammatory condition of the pericardium, attended by an accumulation of sero-albuminous fluid. _Pathology._—Hydropericardium is not a disease of itself, but it is always secondary. The accumulated fluid is usually clear, of an amber color, though it may become turbid by the presence of fibrin or red blood corpuscles. The fluid is alkaline in reaction. _Treatment._—As this disease is always secondary to another, the treatment will also be secondary and all that can be said is that the heart sac should be relieved of its accumulated serous fluid, after the body has received the treatment necessary for the immediate cause of death. Transportation will also be covered by the disease causing death. =Hemopericardium.=—_Definition._—Hemopericardium is an infiltration of blood into the pericardium. It is the result of a rupture of an aneurism of the aorta or coronary arteries, or in rare cases from rupture of the heart. It may also arise from injuries such as bullet wounds, fracture of the ribs, sternum, etc. _Treatment._—This condition is usually secondary to another such as gun shot wound, aneurism of the aorta, etc., so that the treatment must be given under the heading of the immediate cause of death. For transportation requirements also refer to the immediate cause of death and the transportation rules.