SIR THOMAS LEWIS 



haps never will be avoided, in a full consideration of our problem, and 

 it would be presumptuous if my views were brought before you as 

 views approaching to a final solution. Nevertheless, by carefully weigh- 

 ing our present knowledge, certain final statements may be made, certain 

 statements may be denied, and we can bring our conceptions a step 



A 



Fig. 1. Diagrams, illustrating the potential differences in simple muscle 

 strips, activated at one end. 



nearer clarity and truth. Of one thing I feel sure, namely, that a close 

 consideration of the views expressed, and further observations tending 

 either to support or to destroy them, will prove fruitful. 



In considering the meaning of the electrocardiogram, we have all 

 started from a common basis. By common consent, if you place two 

 leading-off electrodes directly on the two ends of a narrow strip of 



