66 CHAP. VII. EFFECT OF ELECTRIC STIMULATION 



rate of growth of the bud of Crinum Lily was 0-35 (x per 

 second. On the apphcation of electric stimulus of unit 

 intensity for 5 seconds, the rate became reduced to 0-22 [jl 

 per second. When the stimulus was increased to 2 units, 

 the rate of the retarded growth was o-oy [i per second. 

 When the intensity was raised to 4 units, there was complete 



Fig. 29. Records of contractile response under increasing 

 intensities of electric stimulation of 0-25, i, and 3 units. 



Records to be read from above downwards. Short vertical lines 

 indicate moments of application of stimulus (Crinum), 



arrest of growth. In fig. 29 are given records of another 

 series of experiments which show the effects of increasing 

 intensity of stimulation in retarding growth. 



Experiment 35. Effect of continuous stimulation, — The 

 effect of continuous electric stimulation of increasing in- 

 tensity will be seen in the record (fig. 30) taken on a moving 

 plate. On application of continuous stimulation of increasing 

 intensity, an increased flexure was produced in the curve, 

 which denoted greater retardation in the rate of growth. 



