xiv CONTENTS 



CHAPTER XXV 



HERSCHEL AND THE HELTER-SKELTER FLIGHT 

 OF THE STARS 



PAGE 



He demonstrates stellar motion, and with it the motion of the whole 

 solar system The grandeur of his ideas The wonderful advance 

 from the time of Galileo to the death of Herschel . .315 



CHAPTER XXVI 



THE MEASURE OF STELLAR SPACES 



The first successful measures of stellar parallax The final proof 

 It supplies the absolute proof of the Coppernican theory The 

 size of the stars The grandeur of Canopus It may be a 

 million times our sun . . . . . .329 



CHAPTER XXVII 



THE SPECTROSCOPE AND THE STUFF OF COSMOS 



The proof that the material of the universe is all the same Other 



revelations A second method of deriving stellar motion . 343 



CHAPTER XXVIII 



OUR PLACE IN SPACE : THE PLURALITY OF WORLDS 



The endeavour to fix the number of the stars The difficulty 

 Probability of thousands of worlds in parallel development to 

 our own . . . . . . . -353 



CHAPTER XXIX 



THE ASTRONOMY OF THE INVISIBLE 



Discovery of dark suns Probability that their number vastly 

 exceeds that of luminous stars Binary or twin suns The 

 spectroscope and stellar collisions . . . . 369 



