POLAR EFFECTS OF ELECTRICAL CURRENT 211 



The effects of feeble ascending and descending currents 

 in the petiole of Mimosa are parallel to those in nerve-and- 

 muscle preparations. In both cases excitation takes place 

 earlier when the kathode is nearer the responding organ. 



As in animal, so also in Mimosa, single induction-shocks 

 of moderate intensity are, as regards polar action, effective 

 at the commencement and not termination of the current. 

 In taking records with single ascending and descending 

 induction-shocks, response is found to take place earlier 

 when the kathode is proximal. 



V 2 



