W. A. Norton—Molecular and Cosmical Physics. 337 
space between them, do not in general neutralize each other, 
and determine an electric vacuum there; for their oblique 
actions on the ether lying on either side of the line of their 
electric ether, at those special interstitial points of the body at 
which the attractive actions of surrounding molecules upon the 
e taken to represent the entire system of waves thus 
