240 W. A. Norton on Molecular Physics. 
ter. It would seem also that the repulsive pulses propagated 
from the atomettes should be more or less intercepted by the 
central atom of the molecule, which should tend to displace the 
center of repulsion still more. For each side of the molecule 
this center must lie somewhere between the center of the atom 
and the surface of the atmosphere, as at r, fig. 4. In this state 
of things the atmosphere will have a definite limit, ‘ 
as before; but beyond its limits, since its repulsion 4. 
must decrease more rapidly than the attraction, an 
effective force of attraction will be exerted by the 
entire molecule. As a consequence, the external 
electric ether will be retained in contact with the 
as the diameter of this envelope; and we shall use these terms 
in the same sense hereafter, unless the exception is di 
The outer electric envelopes of molecules serve to establish 
ration an effective repulsion at this surface, where ote we 
effective force would be zero. It is to be borne in min pee 
the attraction of the central atom is dynamical in its ne ae 
ments will, when propagated outward, neutralize each OFT 
effects, unless a secondary force is developed in the proces : 
Now it is precisely such a force that is developed in the -- @ibet 
Just explained, and this must be propagated by the electri ee 
* Ttis possible that in some cases the outer atmospheric envelope MAY lag 
ides several spherical layers, separated by surfaces of no 
