420 Mr. F. McClean. Comparison of Oxygen with the 



are fairly evenly distributed throughout the sphere. There are 52 

 in the galactic zones and 54 in the galactic polar areas. There are 

 22 in the upper galactic zone (B and BB) and 30 in the lower 

 (0 and CC). There are 27 in the upper polar areas (A and AA) 

 and 27 in the lower (D and DD). 



The general distribution of the types of spectra throughout the 

 sphere to the extent of the observations bears out generally the 

 conclusion that stars with spectra of the more advanced types, in 

 order of development, are evenly distributed in space. Also that 

 stars with spectra more recent in order of development are mostly 

 congregated in the galactic zones. The helium stars of Division I 

 are predominant in the Southern Hemisphere, being congregated 

 in the lower or southerly ha,lves of the galactic zones (BB and CC). 

 They include 48 stars out of a total of 94 stars in those areas. 

 They are also more closely congregated in the vicinity of the galaxy 

 than is the case in the northerly halves of the galactic zones. In 

 the contiguous constellations of Musca, Crux, Centaurus, Lupus, 

 and Scorpio there are 27 helium stars out of a total of 36 stars 

 included in the tables. (The distribution of the helium stars 

 throughout the sphere was illustrated by two small hand charts, 

 .not reproduced, on which these stars are coloured red.) Appa- 

 rently the region in which the first stage of stellar development is 

 now most active lies in the southerly half of the galaxy. 



Table I. 



Photographic Stellar Spectra — Stars to Magnitude 3J. 



Summary of Southern Stars — Regions BB, CC, and DD. 





Mag. 



Div. 



Area. 





Mag. 



Div. 



Area. 



Aquila. 









Argo. 









A 



3 3 



1(5) 



CC 



\ 



2-5 



IY 



BB 











2-9 



IY 



BB 



Ara. 









V 



3-5 



1(b) 



CC 



a 



2-9 



1(b) 



CC 



I 



3-4 



IY 



BB 





2-8 



IY 



CC 



7T 



2-7 



IY 



CC 



7 



36 



1(a) 



CC 



9 



3-2 



III 



BB 



I 



3-2 



IV 



CC 



a 



3 5 



IY 



CC 











T 



3 2 



IY 



CC 



Argo. 









V 



3-4 



III 



CC 



a 



0-4 



III 



CC 











& 



2-0 



II 



CC 



Canis Major. 









y 



3'0 



1(b) 



CC 



a 



-1-4 



II 



CC 



d 



2 2 



II 



CC 





2-0 



1(a) 



CC 



6 



2-1 



IY 



CC 



d 



1-9 



IY 



CC 



I 



2 5 



1(b) 



CC 



£ 



1-5 



1(a) 



CC 



e 



2-9 



1(a) 



CC 



K 



3 



1(b) 



CC 



i 



2-5 



III 



CC 



n 



2-4 



1(b) 



CC 



K 



2-7 



1(b) 



CC 



o 2 



3*0 



1(b) 



CC 



