216 Photographic Spectra of Stars to the 3f Magnitude. 



Table of Distribution of Gaseous Nebulsa and of Stellar Types. 

 Stars to the 3 J Magnitude. 





A. 



B. 



C. 



D. 



Total. 



AA. 



BB. 



CC. 



DD. 



Total. 



Planetary nebulae .... 



2 



3 



8 



2 



(15) 



2 



7 



3 







(12) 



jjjXxenciecL .... 



i 



A. 



4 



g 



4 



H7^ 





4 



3 



T 



X 





lotai gaseous nebuisB . 



O 



i 



16 



g 



(32) 



3 





6 





(91 \ 



Stellar Types. 

























3 



6 



17 



3 



(29) 



6 











„ II... 



10 



7 







3 



(20) 



3 











„ HI 



7 



8 



8 



4 



(27) 



9 











„ iv 



14 



8 



9 



13 



(44) 



9 











„ v 



1 



2 



4 



3 



(10) 



3 











Total stellar spectra 



35 



31 



38 



26 



(130) 



30 











Note. — The gaseous nebnlse are those giyen in the table in Frost's edition of 

 Scheiner's ' Astronomical Spectroscopy.' 



We gather from this table that as the stellar types of spectra 

 become more advanced they are found to be more evenly distributed 

 in space. The idea is suggested that stars of the solar type — 

 Division IY — started their career as helium stars of Division I, 

 before the condensation of the galaxy. 



The Procyon stars of Division III followed in the same way after 

 the galaxy was formed. The paucity of stars of this type in the 

 lower polar region, coupled with their even distribution in the other 

 areas, suggests the idea that the sun itself is situated near the lower 

 boundary of the galaxy. 



The distribution of the Sirian stars, Division II, is anomalous, and 

 further information is required as to their distribution in the 

 southern areas. 



The Orion stars — Division I — are almost confined to the galactic 

 zones. It has been already conjectured that they are still in the first 

 stage of stellar development from the gaseous nebulaa. 



It has been throughout assumed that the successive types or 

 divisions are merely the manifestations of the successive physical 

 states, through which every star naturally passes in the course of 

 its career. 



