"The apparent increase of strength which follows the administration of alcohol in cases of cardiac weakness is delusive. There is increased volume of the pulse for the reason that the small arteries and capillaries are dilated, but this apparent improvement in cardiac action is very evanescent. This is a natural result of the fact that while the heart is relieved momentarily by sudden dilation of the peripheral vessels, the accumulation of the blood in the venous system, through the loss of the normal activity of the peripheral heart, gradually raises the resistance by increasing the amount of blood which has to be pushed along in the venous system. This loss of the action of the peripheral heart more than counterbalances the temporary relief secured by the paralysis of the vasoconstrictors. "Thermic applications, general and local, may safely be affirmed to be the true physiological heart tonic. In the employment of the cold pericardial compress as a heart tonic, the application should generally be continued not more than half an hour at a time, and its use may be alternated with general cold applications to the surface. A cold towel rub, or the cold trunk pack is the best form for application if the patient is very feeble. "The cold towel rub is applied thus: wring a towel as dry as possible out of very cold water, and spread it quickly and evenly over the surface; rub vigorously outside until the skin begins to feel warm; then remove, dry the moistened surface, rub until it glows, and make the same application to another part; and so on until the whole surface of the body has been gone over. The procedure should be rapid and vigorous. "If the cold trunk pack is employed, a sheet of not more than one thickness should be wrung as dry as possible out of very cold water, and wrapped quickly about the body, after first dipping the hands in water, and rubbing the trunk vigorously. In cases of extreme cardiac weakness, very cold and very hot applications may be alternately applied over the region of the heart. The duration of the hot and cold applications should be about fifteen seconds each.