VII.] 



A CHEMICAL CLASSIFICATION OF STARS. 



71 



Taurian. 



Predominant. Hydrogen, he- 

 lium, proto-magnesium. asterium. 



Fainter. Proto-calcium, sili- 

 ciuiu, nitrogen, carbon, oxygen, 

 proto-iron, proto-titanium. 



Rigelian. 



Predominant. Hydrogen, proto- 

 calcium, proto-magnesium, helium, 

 silicium. 



Fainter. Asterium, proto-iron, 

 nitrogen, carbon, proto-titanium. 



Cygnian. 



Predominant. Hydrogen, proto- 

 calcium, proto magnesium, proto- 

 iron, silicium, proto-titanium, 

 proto-copper, proto-chromium. 



Fainter. Proto-nickel, proto- 

 vanadium, proto-manganese, proto- 

 strontium, iron (arc). 



Polarian. 



Predominant. Proto-calcium, 

 proto-titanium. hydrogen, proto- 

 magnesium, proto-iron, and arc 

 lines of calcium, iron, and manga- 



Fainter. The other proto-metals 

 and metals occurring in the Sirian 

 genus. 



Aldebarian. 



Predominant. Proto-calcium, arc 

 lines of iron, calcium, and manganese, 

 proto -strontium, hydrogen. 



Fainter. Proto iron and proto-tita- 

 nium. 



Antarian. 



Predominant. Flutings of manga- 

 nese. 



Fainter. Arc lines of metallic ele- 

 ments. 



Algolian. 



Predominant. Hydrogen, proto- 

 magnesium, proto- calcium, helium, 

 silicium. 



Fainter. Proto-iron, asterium, 

 carbon, proto-titanium, proto-cop- 

 per, proto-manganese, proto-nickel. 



MarJcabian. 



Predominant. Hydrogen, proto- 

 calcium, proto-magnesium, sili- 

 cium. 



Fainter. Proto-iron, helium, 

 asterium, proto-titanium, proto- 

 copper, proto-manganese, proto- 

 nickel, proto-chromium. 



Sirian. 



Predominant. Hydrogen, proto- 

 calcium, proto-magnesium, proto- 

 iron, silicium. 



Fainter. The lines of the other 

 proto-metals and the arc lines of 

 iron, calcium ; and manganese. 



Procyonian. 

 Same as Polarian. 



Arcturian. 

 Same as Aldebarian. 



Pis dan. 



Predominant. Flutings of carbon. 

 Fainter. Arc lines of metallic ele- 

 ments. 



