64 RESPONSE IN THE LIVING AND NON-LIVING 
ten minutes, and two records were taken during that 
time. It was then raised by 10° C., and the same process 
Oferes | 

Fic. 37.—TuHr Guass CHAMBER CONTAINING THE PLANT 
Amplitude of vibration which determines the intensity of stimulus is measured 
by the graduated circle seen to the right. Temperature is regulated by the 
electric heating coil R. For experiments on action of anesthetics, vapour 
of chloroform is blown in through the side tube. 
was repeated. It will be noticed from the record 
(fig. 38) that in this particular case, as the temperature 
20°C 
alt 
JOC 400 SOT 65% Sa¢mm 
S 
SiS (eae 
1 min 
Fic. 38.—Errect or TEMPERATURE ON RESPONSE 
The response was abolished at the hot-water temperature of 55° C. 
rose from 20° C. to 30° C., there was a marked diminu- 
tion of response. At the same time, in this case at. 
