W. A. Norton on Molecular and Cosmical Physics. 27 
ered, until the effective force directed inward is neutralized by 
the outward repulsion of the ordinary atom and the increased 
repulsion of the ethereal atoms lying nearer to this. The 
ultimate result then would be the condensation of an ethereal 
individual pulses, produced by a and the atmospheric atoms 
encountered on lines of propagation, it would be the same as if 
all the repellant matter considered were concentrated at the 
center of a. Asa matter of fact, in consequence of this inter- 
ception, the center of repulsion will be displaced toward the 
exterior atom 6 acted on. Beyond a certain minute distance 
the direct repulsion thus exerted upon 8, will vary inversely as 
the square of the distance from a; and it will at the same 
time be less, at all distances, than the gravitating tendency 
originating in the manner above explained. ‘ 
he excess of this tendency toward the atom (a) of ordinary 
matter above the repulsion exerted by the atom and its atmosphere, 
constitutes the effective force of gravitation due to the atom. It will 
vary, at all measurable distances, according to the law of 
Before inquiring into the dependence of this force upon the 
= re AE BAB in os atl pie 
we will remark that nothing precludes us from supposing that 
the atom of ordinary matter, so called, is actually a mass of con- 
Y, 
pon’ this point, the increased interception of the 
