60 TWO NEW WORLDS 



An interesting question now arises as to what 

 part the light of the infra-world plays in our world : 

 Can we see it, or tell its existence in any way ? The 

 answer is, that infra-light is extreme ultra-violet 

 light, and quite beyond our means of measurement. 

 We possess no instrument capable of directly indi- 

 cating infra-light, even if it exists. But its indirect 

 effects are not beyond hope of discovery. Light is 

 known to exert a perceptible effect upon comets' 

 tails. If infra-light exerts an effect upon the 

 motion of electrons, it may, at some future time, 

 become possible to trace such effect. The most 

 likely substances to show such an effect are the 

 radio-active bodies, and it will be remembered 

 that Professor and Madame Curie assumed the 

 existence of some such radiation to account for 

 the energy of radium. 



Although infra-light is extremely feeble, it must 

 be remembered that if it is emitted by infra-electrons 

 it must be emitted by the whole visible universe. 

 For the visible universe is co-extensive with the 

 infra-world. The latter is a world within a world. 

 To explore the infra-world instead of this world 

 is something like drawing the plan of a house 

 instead of a map of the terrestrial globe. 



Sunlight may contain infra-light as one of its 

 constituents. But since light is only absorbed by 

 electrons having a period akin to its own, infra- 

 light is only absorbed by infra-electrons, and its 



