DR. W. M. HICKS: A CRITICAL STUDY OF SPECTRAL SERIKS. 



109 



satellites in the first two sets. Further, it appears that the P series take the 

 s-sequence and the S series the p-sequence as is the rule outside the alkaliea 



m. 



4. 

 5. 

 6. 

 7. 

 8. 

 9. 

 10. 



2. 



3. 



1. 



2. 



The P Lines. 

 (Figures in brackets give intensities.) 



P,. 



(5)5717-51 

 (5)5258-49 

 (2)5021-67 

 (1)4880-90 

 (2)4791-69 

 (2)4728-95 

 (0)4682-16 



1. (6)6413-54 



*V n,. 



(0)5721-20 17485-35 

 1901170 

 19908-26 

 20482-40 

 2086372 

 21140-54 

 2135178 



S Series. 



(3)6284-66 1558778 

 84-35 



11-27 



319-65 



(6)6379-02 

 (15)3646-46 



(50)3642-93 

 (2)3139-98 



(3)5146-43 

 (6)5392-30 



(\b) 3603-1 



15672-13 



2742371 



25-81 



27449-52 



322-39 



(1)310870 31838-31 



Parallel S Series. 

 (0)5323'1)4 18457-31 



320-37 



320-65 



82-60 

 18539-91 



(2) 3273-76 



17474-08 



15907-43 



27746'K) 



32I58T.H 



1K777'96 



30537-33 



TJie S Series For a reason to be seen shortly, it is necessary to regard S,, ( 1 ), 

 S n (2), S,(3) as the typical series, S,(3) as not displaced, but the doublets corre- 

 sponding to 1 and 2 are displaced collaterally to S. In other words, we have t do 

 with bodily displacements of the first two doublets and not true satellites. The 

 mean of the doublets gives = 320'80, and the formula calculated from the three 

 lines is 



37949-90-N/(m+ 1-244902- 



VOL. CCXIII. A. J G 



