ADDENDUM. 



The great Solar Cone-space, in order to be 

 clearly marked to the eye, was represented in 

 Plate I, page 30, as white. This to some read- 

 ers may be misleading ; as this space when 

 viewed transversely is not luminous, it is not 

 even visible. (PI. V.) 



PI. v. 



Outside of the atmospheric envelope of all 

 spheres, there is only "the black of infinite 

 space." * 



Retro-action between the earth and visible 

 and invisible spheres, gives to the earth the 

 light which it possesses during the night-season. 



* Flammarian. 



