INORGANIC RESPONSE 99 
results conclusively prove that the responsive electro- 
‘motive variation is solely due to the molecular 
disturbance produced by mechanical vibration in the 
acted wire. 
A new and theoretically interesting molecular voltaic 
cell may thus be made, in which the two elements con- 
sist of the same metal. Molecular disturbance is in this 
case the main source of energy. A cell once made may 
be kept in working order for some time by pouring in 
a little vaseline to prevent evaporation of the liquid. 
It will be shown further, in succeeding chapters, by 
numerous instances, that any conditions which increase 
molecular mobility will also increase intensity of response, 
and conversely that any conditions having the reverse 
effect will depress response. 
H 2 
