THE CENTURY'S PROGRESS IN ASTRONOMY 



be perpetuated individual solar systems, such as ours, 

 being born, and growing old, and dying to live again in 

 their descendants, while the universe as a whole main- 

 tains its unified integrity throughout all these internal 

 mutations passing on, it may be, by infinitesimal stages, 

 to a culmination hopelessly beyond human compre- 

 hension. 



