230 PLANT RESPONSE 



Summary 



Motile excitability is temporarily abolished by anaes- 

 thetics. 



Strong application of cold produces a temporary abolition 

 of motile excitability. Moderate application of cold prolongs 

 the latent period. 



Similarly, fatigue produces a diminution or abolition of 

 motile excitability ; and this is restored, after a sufficient 

 period of rest. 



Conductivity, similarly, undergoes diminution as the 

 effect of cold, anaesthetics, and fatigue. 



Receptive excitability, again, undergoes diminution or 

 abolition by the action of similar agencies. 



Conductivity may persist even after the abolition of 

 motile excitability. Hence a strong stimulus may be con- 

 ducted through a region which exhibits no motile excit- 

 ability. 



