194 CHAP. XVII. WIRELESS STIMULATION 



The response is modified by the tonic condition of the 

 organ and the intensity of stimulation. 



In response to wireless waves, growing plants exhibit 

 modification of their rate of growth. Feeble stimulation 

 induces an acceleration, while strong stimulation causes a 

 retardation of the rate of growth, as has already been shown 

 to be the case in response to other forms of stimulation. 



