CHAP. IV 



ELECTROMOTIVE ACTION IN MUSCLE 



407 



Left hand and right hand. ] 

 Right hand and left foot. 

 Mouth and left hand. 

 Mouth and right foot. 

 Mouth and left foot. 



Fig. 134. 



FIG. 134. Schema of distribution of potential caused by the cardiac action current at the body- 

 surface in Man, and in the Cat. The dark parts correspond with the lead-oft" from the appx, 

 the lighter with the lead-off from the base. (A. D. Waller.) 



The unfavourable combinations were : 



Left hand and left foot. 

 Left hand and right foot. 

 Right foot and left hand. 

 Mouth and ritrht hand. 



These facts may be explained by the distribution of the lines 

 of current, or potential, in the body (corresponding with the action 

 currents of the heart). In mammals the approximately median 



