378 DR. W. M. HICKS: A CRITICAL STUDY OF SPECTRAL SERIES. 



Note how Zn still affects <? 6 . The variations from multiples in Hg seem to have 

 relation to the transference properly noted above, viz., from Aj to A 2 . 



Al (J, = 26'57). Tl (,?, = 376-835). 



1751 (1) 134154 (?) 



16S,-3 538 2 + 191 



1329(78,78) 94018(1) 



-25 t + 5 23-191 



1377(23,23) 91195(?) 



0-3 2S,-173 



1380(48,48) 90615 (?) 



In Al the value after the first is 1381 within limits of error for all. 



The S and P Connections. The differences of the corresponding denominators in 

 the S and P are also given in [II.]. The values are, however, subject to uncertainties 

 due to uncertain limits in both S and P, in which the are not the same for both. 

 In the case of the alkalies there seems a very clear connection with the A, except in 

 Cs, where as often before S enters. In the other elements it was shown that the 

 sequences are inverted and the differences are to be taken between the first of the S 

 and the second of the P. In Al, Tl, and Zn, there is again a clear relation, but it is 

 now to the denominator differences of the Pj (2) and P 2 (2), or 1329, 94018, 2525 

 respectively, say A' for each. In the case of Cd and Hg no clear relation is apparent, 

 although they behave approximately like Al and Tl. This want of exact agreement 

 may be due to the effect of the transference inequalities considered above (p. 333) 

 in connection with the oun. The relations indicated above are shown in the following 

 scheme, in which the differences for the S and P are taken from [II., p. 51-53]. 



Na . . . . '490162 = '5-13A, 



K . . . . '464597 = '5-12A, 



Rb . . . . '487501 = '5-A, 



Cs .... '491944 = '5-14(5 (roughly). 



Al .... "489330 = '5-8x1334 = '5-8A', 

 Tl . . . '594887 = '5 + 94887 = '5 + A'. 



' Zn .... '528306 = '5 + 11x2573 = -5 + 11A', 

 Cd . . . . '526358 = '5 + 26358, 

 . . . . '603628 = '5+103628. 



