410 VEGETABLE PHYSIOLOGY 



much less than that exhibited by an animal ; but this, as 

 we have seen, depends upon the differences in the motor 

 mechanisms. In the vegetable protoplasm we have a 

 much slower response, as well as one of a different 

 kind, the effects taking as a rule longer before they are 

 fully manifested and lasting for a longer time after the 

 stimulus has been withdrawn. We have however, as in 

 the animal mechanism, a much better response to a cumu- 

 lative or prolonged stimulation than to one which is rapid 

 and transitory. 



