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COHN— STUDY OF THE 



[April 23, 



Fig. 4. Electrocardiogram showing the three usual leads of Einthoven. 

 From a heart showing hypertrophy of its right ventricle. 



Fig. 5. Electrocardiogram showing the three usual leads of Einthoven. 

 From a heart showing hypertrophy of its left vertricle. 



