( 301 ) 
only refer to triplets, but, I think, we may consider also these 
observations concerning quadruplets as indications in favour of the 
theory. 
6. The line 3733.46 is so modified as to be a triplet, the com- 
ponent toward the violet being at a smaller distance from the 
original line than the component toward the red. There seemed to 
be no inequality of intensity of the outer components. Of the triplet 
3824.58 the component toward the violet is apparently more intense 
than the component toward the red. It does not seem to me very 
probable that in the last mentioned case there is some perturbation 
by the presence of the air-line 3824.4 (Nrovrus), because the 
component is tar from hazy and the air-line very faint. It is invisible 
upon a negative taken with a very low field but with a time of 
exposition equal to that used in taking the negative with the more 
intense component toward the violet. 
It must remain for further inquiry to decide whether these obser- 
vations must be explained by an extension of theory or by some 
perturbating cause not yet taken into account. 
7. From the mentioned observations we may draw, I think, the 
conclusion that the observed asymmetries are very probably real. 
The extreme minuteness of the asymmetry makes it desirable however 
to establish further its reality. I hope to do this in a future paper. 
Finally it is to be observed, as was remarked to the author by 
Prof. Vorer, that my observation does not decide between his theory 
and that of Lorentz, but confirms the common basis of both theories’). 
[Addition of Jan. 15. I have lately found that in the case of 
the triplet and quadruplet of cadmium 4678 and 4800, and the 
triplet and quadruplet of zine 4680 and 4722, the outer components 
toward red are decidedly more intense than the components toward 
violet. Measurements of the distances were not yet made. 
The line 3733 mentioned in § 6 happens to be one of the lines 
showing “reversed polarisation.” Probably this deviation from the 
normal polarisation will account also for the reversed asymmetry of 
the distances. 
I doubt however at the possibility of the suggested explanation 
in the case of a few other lines, lately examined, and which appar- 
ently exhibit the behaviour mentioned in the beginning of § 6.] 
1) The relation between these theories is exposed by Lorenrz, Physik. Zeitschrift 
d. Riecke u. Simon. 8. 39. 1899, 
