_Pathology._—The blood clots are found most frequently in the right side of the heart. They vary in size, from that of a pin head to that of a hen's egg. When degeneration takes place, softening follows, and sometimes particles become dislodged and float off to set up thrombi in other viscera. _Treatment._—Remove the maximum amount of blood by drainage along with the injection of fluid. The fluid in this case should be not more than half strength for the first part of the injection, to be followed by enough normal fluid to secure preservation. If thrombi have lodged in any of the larger arteries, the circulation to the part reached by the branches of the artery will be affected. This can be overcome by injecting an artery close to the part which is not receiving the fluid. Massage the face downward to assist capillary circulation. Give a complete cavity injection. For transportation, govern yourself according to the provisions of the transportation rules. =Hypertrophy of the Heart.=—_Definition._—Hypertrophy of the heart is an enlargement of the organ, due to an increase in the volume of its muscular fibers, and usually also to dilatation of its cavities. _Treatment._—Secure full drainage from the veins. Drainage will be stimulated by an injection of half strength fluid for the first part of the injection and a massage of the face. Follow the first part of the injection with enough normal fluid to secure preservation. Give a complete cavity injection. For transportation, govern yourself according to the provisions of the transportation rules. =Cardiac Dilatation.=—_Definition._—Cardiac dilatation is an increase in the size of the cavities of the heart, due either to thickening or thinning of the walls. _Treatment._—Treat the same as for hypertrophy of the heart. =Cardiac Atrophy.=—_Definition._—Cardiac atrophy is a decrease in the size, strength, weight, and activity of the heart. _Treatment._—Remove blood by drainage, and inject half strength fluid for the first part of the injection. The amount of fluid need not be as great as in the acute disease of the heart. Massage the face downward. Give cavity injection. For transportation, govern yourself according to the provisions of the transportation rules. =Arterio-Sclerosis.=—_Synonyms._—Endarteritis; Atheroma; Arterial Sclerosis. _Definition._—Arterio-sclerosis is an inflammatory and degenerative condition of the arterial system, primarily of the intima, although later degenerative changes may involve the whole structure. Calcarine deposits are quite common. _Pathology._—As a result of proliferation, infiltrated areas begin in the middle and outer coats. These nodules vary in size from that of a small shot to that of a large coin. As they increase in size, the intima loses its smoothness and becomes thickened and rough. As these changes progress, the middle and outer coats are weakened. Calcification may also occur in the wall.