effect of electric stimulation 85 



Acceleration of Growth under Electric 



Stimulation 



Experiment 49. — I took a subtonic seedling of Wheat, 

 whose rate of growth was as low as 0-05 [i per second. 

 After electric stimulation, the rate was found to be 

 enhanced to o-i2 [i, per second or about 2 J times. I give 

 I wo records obtained with different specimens (fig. 41). 1 he 

 two vertical records to the left of the figure were taken 



Fig. 41. Electric stimulation enhancing rate of growth 

 of subtonic plant (Wheat). 



N, normal record ; s, after stimulation. 



on a stationary plate. The closeness of the dots in N shows 

 the feeble rate of growth of the subtonic specimen. After 

 application of electric stimulus the record S shows, by 

 the wider spacings between successive dots, the induced 

 enhancement of growth. 



In the second experiment the records (fig. 41, b) were 

 taken on a moving plate. The specimen was so extremely 

 subtonic that its normal record N appears almost hori- 

 zontal. The marked erection of the curve S after stimula- 

 tion demonstrates the induced acceleration of growth. 



