3l6 CHAP. XXIX. GEO-ELECTRIC RESPONSE OF THE SHOOT 



Fig. 191. Geo-electric response of the physically restrained scape 



of Eucharis Lily. 



Up-curve represents responsive current from upper to lower 

 surface during action of geotropic stimulus. Down-curve 

 represents recovery on cessation of stimulation. Response 

 commenced after latent period of i minute ; after-effect per- 

 sisted for 2 minutes. Breaks in curve are due to obscuration 

 of recording spot of light at brief intervals. 



Fig. 192. Successive responses, first a above and secondly b above 



(Polianthes tuberosa). 



