198 
this condition as restriction of the ‘“Kombinationsprinzip’. That 
there must somehow exist a _ restrictive condition, does not seem 
doubtful to me. 
That however in some cases the non-appearance of a middle 
component can yet be ascribed to the observation, may appear from 
the following example: 
In my paper (loc. cit.) the ZeumAn-effect for A" is given as an 
octet without middle component, here as a nonet with middle 
component. 
My first statement was among other things based on the obser- 
vations by Mrrrer *), who has not found a middle component, 
whereas WeNpr ®) does find the middle component for the same 
lines: “bei dem zweiten Begleiter ist die mittlere Komponente über- 
sehen”. (p. 559). 
From this it may, therefore, appear that it is by no means impos- 
sible that some of the observed types of ZrrMAN-effect are incomplete, 
and that possibly some of the “superfluous” components found by 
me will after all appear to be present on closer observation. 
The outer components of A" are marked with a note of inter- 
rogation. These components have been found both by Wenpr (loc. 
cit.) and Minurr (loc. cit), the distances to the middle component 
are, however, somewhat smaller than agrees with 2e. The state of 
polarisation could not be determined by Minter on account of the 
slight intensity; Wenpr finds 1. 
The other notes of interrogation are found beside Hd. Wernpt 
finds for this ten components, whereas Mituer has observed twelve. 
The latter observer remarks here, however (loc. cit. p. 117): 
“Die durch Klammern zusammengefassten Linienpaare liefen in 
eine Linie zusammen, wenn beide Arten von Schwingungen zuge- 
lassen waren”. 
When this is taken into account, the notes of interrogation may 
be omitted, and « and —e may be substituted for them. 
The O-component has, however, not yet been accounted for. 
Another factor that remains to be explained, is the state of pola- 
risation of the components. 
Though here for the anomalous Zxeman-effects, just as for the 
normal triplet, the outmost components appear always to be pola- 
rized 1, 1 must confess that I have not yed succeeded as yet in 
1) W. MiLuer, Zeeman-effekt an Mg. Ca. u.s.w. Ann. d. Physik, 24, p. 105, 
1907. 
4) G. Werpr, Untersuchungen an Quecksilberlinien. Ann. d. Physik, 37, p. 535. 
1912. 
