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 

Fic. 25.—E¥Frect 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. 
