298 PROF. J. C. BOSE ON ELECTRIC RESPONSE IN 
entirely disappeared, whereas the electric response of the hardier 
holly and ivy remained almost the same as before. 
Influence of High Temperature.—I next tried to determine the 
high temperature at which the response disappeared altogether. 
I took six radishes, and put them in water whose temperature 
was gradually raised. I examined their responsiveness at 
different temperatures. In this way observations were made 
with each specimen till the death-point was reached, when there 
was a total abolition of response. With different specimens of 
i 
i 
al 
The plant chamber.—Amplitude of vibration which determines the intensity 
of stimulus is measured by the graduated circle seen to the right. ‘The 
glass chamber is air-tight. Temperature is regulated by the electric 
heating-coil R. For experiments on anesthetics, vapour of chloroform is 
blown in through the side tube ¢, 
radish I found the death-point to lie between from 50°C. and 
55°C. The experiment just described was rather troublesome, 
inasmuch as, in order to produce each variation of temperature, 
the specimens had to be taken out of the apparatus, warmed an 
remounted. JI introduced an experimental moditication which 
obviated this difficulty. The vibration apparatus containing the 
specimen was enclosed in a chamber, in which there was 4 spiral 
