70 INORGANIC EVOLUTION. [CHAP 



that the form of the words used to define them should be common to 

 both ; hence I suggest an adjectival form ending in ian. If the typical 

 star is the brightest in a constellation, I use its Arabic name as root ; if 

 the typical star is not the brightest, I use the name of the constellation. 

 The desideratum referred has to a certain extent determined the 

 choice of stars where many were available. I have to express my 

 great obligations to Dr. Murray for help generously afforded in the 

 consideration of some of the questions thus raised. The table runs as 

 follows : 



CLASSIFICATION OF STARS INTO GENERA DEPENDING UPON THEIR 

 CHEMISTRY AND TEMPERATURE. 



Highest temperature, simplest chemistry. 



Argonian. 

 Alnitamian. 



Crucian. 

 Taurian. 

 i Bigelian. 

 g, Cygnian. 



1 Polarian. 

 ^ Aldebarian. 

 Antarian. 



Achernian. 



Algolian. 



Markabian. 



Sirian. 

 Procyonian. 

 Arcturian. 

 Piscian. 



The cheirical definitions of the various groups or genera are as 

 follows : 



DEFINITIONS OF STELLAR GENERA. 



Argonian. 



Predominant. Hydrogen and proto-hydrogen. 

 Fainter. Helium, unknown (\4451, 4457), proto-niagnesium, 

 proto-calcium, asteriuni. 



Alnitamian. 



Predominant. Hydrogen, helium, proto-silicium, unknown 

 (A 4649-2). 



Fainter. Asterium, proto-hydrogen, proto-magiiesiuni, proto- 

 caleium, oxygen, nitrogen, carbon. 



C Crucian. \ Achernian. 



Predominant. Hydrogen, he- \ Same as Crucian. 

 Hum, asterium, oxygen, nitrogen, 

 carbon. 



Fainter. Proto -magnesium, 

 proto-calcium, proto-silicium, un- 

 known (A 4649'2), silicium. 



