68 TWO NEW WORLDS 



life in our world, however highly developed, will 

 not be able to produce new results on an astrono- 

 mical scale, or to affect the motion of heavenly 

 bodies. 



The same analogy gives us a new conception of 

 the permanence of our own universe. During the 

 last century we have been, unknown to ourselves, 

 surveying and examining the properties of the 

 infra-world over a period of a quadrillion infra- 

 years. They show no sign of variation, although 

 the chances of such variation are as great as the 

 chances our world would get in a quadrillion of 

 our years. But this argument can be logically 

 extended into infinity. For an inhabitant of the 

 infra-world can, in a period of 100 infra-years, 

 make the same statement concerning the next 

 lower world (which we might call the infra 2 -world), 

 any essential change of which would react upon 

 the superior world it constitutes. The constancy 

 of natural laws is, tJierefore, an objective proof of 

 the infinite duration and stability of our universe. 



4. It is a curious though somewhat idle calcu- 

 lation to determine the number of electrons con- 

 tained in the adult human body. It is about 10 31 . 

 Now, the earth contains at least 1,000,000,000 (10 9 ) 

 human beings, not to mention other living beings. 

 Therefore, the number of infra-men which we can 

 accommodate in our own bodies figures out at 

 about 10 40 . And yet the total activity of all these 



