26 



INORGANIC EVOLUTION. 



[CHAP. 



keenest interest in my solar work, I wrote, " II semble que plus une 

 etoile est chaude plus son spectre est simple." 



I also pointed out the close relation of hydrogen to calcium, mag 

 nesium and other metals (it was on this ground that I had named the 



I 



substance which gave D 3 , which always varied with hydrogen, helium), 

 and the absence of all other terrestrial gases from the solar spectrum. 

 An interesting discussion at the Paris Academy of Sciences was thus 

 concluded by M. Dumas : 



