292 PROF. J. Co BOSE ON ELECTRIC RESPONSE IN 
Fig. 14. 
<—30 S€6, = ~~ -- > a 
Additive effect of singly ineffective stimuli in plant. 
exhibits fatigue. The following record (celery) exhibits rapid 
fatigue (fig. 15). 
Fig. 15. 
QO. 
| ——— 
Fatigue under continuous stimulation (Celery). 
The effect of rest in producing molecular recovery, and hence 
im the removal of fatigue, is well seen in the set of curves in 
fig. 16. The first shows the curve obtained with a fresh plant 
which had long previous rest. The effect is seen to be very 
large. Two minutes were allowed for recovery, and the stimu- 
lation was again repeated for two minutes. The response in 
this case is seen to be decidedly smaller. The third record 
is somewhat similar to the second. A period of rest of five 
minutes was now allowed, and the curve obtained subsequently ’ 
owing to partial removal of residual strain, is found to exbibit 
greater response. 
