excitatory i'olar 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. 



r>. With moderately strong E.M.F. the kathode excites at 

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

 make. 



