308 Mr. H. Eamage. Spectra of Potassium, Rubidium, [May 14, 



also substitute for fi (assuming it to have a constant value for the 

 series) the value 



/* = 0-7869- 1466 W 2 x 10~ 8 , 

 we obtain the following results : — 



Potassium 



m. 



Oscillation frequencies. 



Differences. 



Observed. 



Calculated. 



3 





14214 -6 





4 



17141 -3 



17122 -4 



-18 -9 



5 



18651 '8 



18653 '3 



+ 1-5 



6 



19553 -1 



19557 -1 



+ 4-0 



7 



20132 -5 



20134 -7 



+ 2-2 



8 



20528 



20526 -1 



- 1-9 



9 



22814 



20803*6 



-10 -4 



10 



21002 



21007 -4 



- 5-4 



m. 



Oscillation frequencies. 



Differences. 



Observed. 



Calculated. 



3 





14272 -4 





4 



17199 -5 



17180 -2 



-19-3 



5 



18709 -6 



18711 -1 



+ 1-5 



6 



19611-1 



19614 -9 



+ 3-8 



7 



20190 -1 



20192 -5 



+ 2-4 



8 



20583 



20583 -9 



+ 0-9 



9 









10 









Rubidium 



m. 



Oscillation frequencies. 



Differences. 



Observed. 



Calculated. 



3 





12763 -2 





4 



15870 -5 



15854 -4 



-16 -1 



5 



17463 -2 



17462 -3 



- 0-9 



6 



18403 -9 



18404 -0 



+ o-i 



7 



19004 -0 



19002 -3 



- 1-7 



8 



19407 -2 



19406 -1 



- 1-1 



9 



19693 -6 



19691 -3 



- 2-3 



10 



19902 



19900 -3 



- 1-7 



11 



20062 



20057 -9 



- 4-1 



