LONGITUDINAL TRANSMISSION OF EB'FECT OF STIMULUS 275 



through S, the securely held tissue (Fig. 98). A feeble 

 stimulus was applied on one side, at the invlifferent 



Fig. 98. — Diagrammal ic representation of effects of indirect and direct sti- 

 mulation. Continuous arrow represents the indirect stimulation, and the curved 

 continuous arro w above, the induced negative curvature : dotted arrow indicates the 

 application of direct stimulus, and the dotted curve above, the induced positive 

 curvature. 



point about ',\ cm, below the region of growth. The 

 positive effect of indirect stimulus reached the region 

 of growth on the same side, bringing about an accelera- 

 tion of growth with expansion and convexity, the resulting 

 movement being negative or away from the stimulus. The 

 latent period was ten seconds, and maximum negative 

 movement was completed in the further course of ten 

 seconds, after which there was a recovery in the course 

 of 75 seconds. A stronger stimulus S' gave a larger 

 response ; but when the intensity was raised still higher to 

 S", the excitatory negative impulse overtook the positive 

 within 15 seconds of its commencement ; the convex was 



