OF THE COSMOS. NEW STARS. 137 



of the concentration to a central nucleus, and of the hypo- 

 theses respecting the gradual development of solid celestial 

 bodies from a vaporous fluid, which gained acceptance at 

 the commencement of the present century ; but which now, 

 according to the ever-varying fluctuations of the world of 

 thought, have become subject to fresh doubts. 



We may, with more or less certainty, reckon among the 

 new ' ' temporary" stars the following, which I have arranged 

 in the order of their first shining forth : 



