CHAPTER II 



THE FORCES OP THE INFRA-WORLD 



1 . WE have seen that in the infra-world, the world 

 where atoms and electrons stand for suns and planets, 

 the absolute velocities are of the same order as those 

 in our world, but that all lengths and times are re- 

 duced in the same proportion viz. 10 22 to 1. 



From these data we can, without further trouble, 

 deduce that all surfaces are reduced in the ratio 

 of 10 44 to 1, and all volumes in the ratio 10 66 to 1. 



But there are a large number of other quanti- 



apart from these geometrical and kinematic al 



quantities, and it will be of interest to consider in 



what proportion they are reduced or increased in 



descending to the infra-world. 



The most important of these is mass, or the 

 quantity of inertia opposed by a body to a given 

 moving force. If densities were of the same order 

 in both worlds, masses would be reduced to the 

 same extent as volumes viz., in the ratio of 10 06 to 

 1 . This, however, is not the rule in the solar system, 

 where Jupiter has only about one-fourth of tin- 

 density of the earth. :m<l the sun is specifically 

 tor even than that. Thus we may expect bodies 



