22 TWO NEW WORLt>S 



eight times, and R is halved. Hence, on the whole, 

 the centrifugal force will be one-fourth of the present 

 force which keeps the moon in its orbit. But it will 

 be four times too large for the very feeble gravita- 

 tional attraction, and so the moon will fly off into 

 space. 



The fact that, though such a proportional reduc- 

 tion is made in the world of atoms and electrons, 

 yet the electrons revolve about their atoms in orbits 

 whose existence is demonstrated by every ray of 

 light, shows that the central forces must greatly 

 exceed the Newtonian attraction. 



We know what this new central force is. It is the 

 force of electrostatic attraction. We might almost 

 say that it is specially designed to make possible the 

 existence of an infra-world on the pattern of our own 

 universe, but on a very minute scale. Incidentally, 

 the electric force produces a variety of interesting 

 terrestrial phenomena. But, essentially, it may fitly 

 be described as the " gravitation of the infra-world." 



