it is desirable to demonstrate the meaning of the T wave. In the normal human subject it is not easy to produce T wave changes. For this reason any experimental method has considerable value. This paper describes a simple method of demonstrating the effect of delayed and enhanced recovery of the ventricles by the use of a hollow electrode or thermode, which can be cooled or warmed. In use, the thermode is placed in contact with the surface of the left ventricle of an experimental animal..

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