250 W. A. Norton on Molecular Physics. 
The particles of each body, if non-conductors, should also be 
come polarized, after the same manner essentially as already ex- 
plained (p. 242), and in this condition would serve to retain the 
surfaces in their disturbed state (p. 245-6). The explanation 
here given is sustained by the effect of heat when applied to 
one of the surfaces, which is to dispose that surface to take the 
negative state, and in fact the heat-pulses should expand the 
molecular atmospheres (p. 73) and’tend to produce a discharge 7 
of electric ether from their outer sides. The like tendency of 
_ roughness of surface may be explained in a similar manner. 
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mospheres, and, as a consequence, the polarization materia 
erease if not ultimately disappear. In this event the fin be 
would be due chiefly, or entirely, to the molecular attr a 
proper, as in the case’ of similar molecules. It is in ths 
thes A disturbing action from the molecular attraction, may even pec ie Fond : 
tion when the molecules are beyond the range of effective attraction, t op the 
Oe, Fig. 1. For it is to be observed that in the action of each — im od 
atmosphere of the next, the attractive impulses prevail over the separ 
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