EFFECTS OF ANODE AND KATHODE 237 



it is possible to demonstrate further the remarkable effects 

 of the break of kathode and break of anode. The difficulty 

 in this experiment lies in the fact that the application 

 of an intensity of current, greater than is exactly sufficient 

 to induce the arrest, is apt to bring about fatigue, with the 

 abolition of pulsation. I have several times succeeded in 



Fig. 118. — Alternate effects of anode and kathode in dimin- 

 ishing systolic contraction and diastolic expansion. 



inducing an arrest which was not followed by a permanent 

 abolition of excitability. In these cases it is possible to 

 exhibit the very interesting effects of break of kathode 

 and of anode. In fig. 119 is seen the arrest at systole induced 



Fig. 119. — Arrest at systole by 

 the make of kathode and 

 diastolic expansion as im- 

 mediate effect of break of 

 kathode. 



Fig. 120. — Arrest at diastole 

 by the make of anode and 

 systolic contraction as im- 

 mediate effect of break 

 of anode. 



by the make of kathode. The current was then broken, and 

 as an immediate result an expansive or diastolic phase of 

 pulsation was obtained, followed by several other pulses 

 of somewhat diminished amplitude. The effect of break of 

 anode, on the other hand, is exactly opposite. In fig. 120 



