﻿and the Theory of Atomic Structure, 561 



and Os, and in the lighter elements Sb and part of the 

 Ce-spectrum. In many respects his results agree very well 

 with ours ; there are, however, also some important diver- 

 gences *. It seems to me that, in general, Mr. Dauvillier 

 attaches too much importance to some lines, which he could 

 only establish for one or for very few elements. 



Diagram IV. — Niton, Xenon, and Krypton. 



„ /? -r*- : « 



/J „ .' 





'j • 







r w/ ' i 













* " ii 











1 







































71 









A, | • — ■ 



















"j ' ■■"' 











I 











A'j , II ■ - 

















■ 



























\ 











fy "I 





. 

















1 









/7 * 



1 











































ATc 



, c 



if 



>-. 



<■■ i 



r i 





n, j - 

































t 

















" J I 



f 

















































..— 









LA 



1 



n ? 



i 4 



i 



\ 



, a,. 



%f% 



7s 4 



1 



T,f% 



*& 



K 



uX 



























L 2 ■ 











j 









C J 



















































/( a z a,fifi /3 t 





b3 2 



a J 2 

 a 3, 

 b 3, 



*2 : 

 a 2, 

 12, 



~ 6/ y 



§ 2. In Parts I. and III. the level diagrams for niton, 

 xenon, and krypton have been given. These constitute a 

 summary of the measurements, giving at the same time an 

 idea of the successive development of the shells of electrons 

 according to Bohr's theory. 



Diagram IV. represents a combination of these former 

 diagrams. The line y s , which now has been established for 



* Compare D. Coster. Comptes Rendus, clxxiv. p. 378 (1922). 

 Phil. Mag. S. 6. Vol. 44. No. 261. Sept. 1922. ' 2 



