excitatory polar effects of currents 1 99 



Summary 



Polar effects are observed in plants in every way similar 

 to those obtained from animal tissues. The laws of polar 

 excitation in plants are as follows : 



A. With feeble E.M.F. the kathode excites at make, and not 

 at break. The anode excites at neither make nor break. 



B. With moderately strong E.M.F. the kathode excites at 

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

 make. 



