110 RESPONSE IN THE LIVING AND NON-LIVING 
the first taken on the day of the experiment. The ampli- 
tudes of vibration were 45°, 90°, and 135°. In(b) are 
given the records of the next series, which are in every 
case greater than those of (a). This shows that pre- 
vious vibration, by conferring increased mobility, had 
heightened the response. In this case, removal of mole- 
cular sluggishness is attended by greater intensity of re- 
sponse, without much change in the period of recovery. 
In connection with this it must be remembered that 

60" 
ITG: 
(a) Three sets of responses for 45°, 90°, and 135° vibration in a sluggish wire. 
(b) The next three sets of responses in the same wire ; increased mobility con- 
ferred by previous vibration has heightened the response. 
ereater strain consequent on heightened response has a 
general tendency to a prolongation of the period of 
recovery. 
It is thus seen that when the wire is im a sluggish 
condition, successive vibrations confer increased mole- 
cular mobility, which finds expression in quickened re- 
covery or heightened response. 
Effect of temperature.—Similar considerations lead 
us to expect that a moderate rise of temperature will be 
conducive to increase of response. This is exhibited in 
