W. A. Norton on Molecular Physics. 249 
tices at the end of the metallic line through the ball. The 
luminosity of the detached particles is to be ascribed to the 
_ vibratory movements imparted by the discharge to the electric 
_ atmospheres of the particles. 
 Becitation of Electricity.—There are various special modes of 
_ exciting electricity, but they are all only so many different modes 
_ of polarizing contiguous molecules; or, more comprehensively, 
: Surfaces are pressed together, especially if they ‘are brought 
Within the limits at which a force of adhesion would come into 
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 tavelopes would, on the outer side of the molecules, have an 
_ ‘Sees of electricity, and on the inner a deficiency. The reverse 
Would be true of the other surface. This is the probable explana- 
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