PLANT RESPONSE 



43 



The effect is seen to be very large. Two minutes were 

 allowed for recovery, and then stimulation was repeated 

 during another two minutes. The response in this case 

 is seen to be decidedly smaller. A third case is some- 

 what similar to the second. A period of rest of 

 five minutes was now allowed, and the curve obtained 



FIG. 25. EFFECT OF CONTINUOUS VIBRATION (THROUGH 50) IN CARROT 



In the first three records, two minutes' stimulation is followed by two minutes' 

 recovery. The last record was taken after the specimen had a rest of five 

 minutes. The response, owing to removal of fatigue by rest, is stronger. 



subsequently, owing to partial removal of residual 

 strain, is found to exhibit greater response. 



The results thus arrived at, under the simple 

 conditions of vegetable life, free as they are from all 

 possible complications and uncertainties, may perhaps 

 throw some light on the obscure phenomena of fatigue 

 in animal tissues. 



