This page has been validated.
314
ELECTRIC RESPONSE IN ORDINARY PLANTS
feeble stimulus, and the second b is the response to the same stimulus repeated in quick succession, thirty times.
Fig. 89. Additive effect of singly ineffective stimuli in plant.
Effect of Steam
The plant was mounted in a chamber into which steam could be introduced. I had chosen a specimen which gave regular responses. On the introduction of
Fig. 90. Effect of steam in abolishing response with death of plant. The two records to the left give responses at 20° C., after which steam was introduced.
