POLAR EFFECTS OF MODERATE CURRENTS 233 



and the relative sensitiveness of plant and animal to this 

 form of stimulation. These will be dealt with in the follow- 

 ing chapters. 



Summary 



The polar effects observed in diverse sensitive plants are 

 in every way similar to those in animal tissues. The Laws 

 of Polar Excitation in Plants are : — 



I. With feeble current the kathode excites at make and 

 not at break. The anode excites at neither make nor break. 



II. With current of moderate intensity the kathode 

 excites at make and not at break. The anode excites at 

 break and not at make. 



