300 PROF. J. C. BOSE ON ELECTRIC RESPONSE IN 
in five minutes the response disappeared with the death of the 
plant (fig. 23). 
It will thus be seen that those modifications of vital activity 
which are produced in plants by temperature variation can 
Fig. Dt) 
Responses to uniform stimuli under varying temperatures. Counting from the 
lof . . 5 < 
left, the responses ar» for temperatures (in Centigrade) 20°, 20°, 22°, 38°, 
03°, 60°, 65°, GO, 51°, 45, 40°, 38°. 
Fig. 23. 
Effect of steam in abolishing response with ceath of plant. The two records 
to the left give responses at 20° C., after which steam was introduced. 
be very accurately gauged by the electric response. Indeed, 
it may be said that there is no other method by which the 
moment of arrest of vitality can be so satisfactorily distin- 
guished. Ordinarily, we are able to judge that a plant has 
