282 



SCIENCE PROGRESS. 



GASX. 



* Means that these lines are out of the range of my observations. 



The annexed reproduction of a photograph of Bellatrix 

 will show how striking has been the result of the discovery 

 so far as stellar spectra are concerned. 



Hydrogen, helium and gas X are thus proved to be 

 those elements which are, we may say, completely repre- 

 sented in the hottest stars and in the hottest part of the 

 sun that we can get at. Here then, in 1895, we have 

 abundant confirmation of the views I put forward in 

 1868 as to the close connection between helium and 

 hydrogen. 



