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3960 tenth metres in the second and a somewhat smaller part in 
the third order. 
I did not introduce a Nico. between the spark and the slit. The 
strength of the field may be roughly characterized by the state- 
ment that about two thirds of the more intense lines were resolved 
into triplets or quadruplets (showing with the field used for the greater 
part as doublets). It was now possible to look for inequality of 
intensities and at the same for asymmetry of the distances. Excluding 
the Jines where the before mentioned perturbations interfered '), I 
have found several lines, which showed the asymmetries predicted 
by Vorer ; it is true, in a very small degree. Some lines showed the 
asymmetry of the intensities only or of the distances only, but other 
lines the two asymmetries at the same time. The phenomenon is 
however extremely small. 
The difference of the distances between the components toward 
red and toward violet and the original line never exceeds a few 
percent. 
For the moment I will not communicate the amount of the asym- 
metries of different lines. Either both or one of the asymmetries 
are shown by the following lines: 
3498.00, 3687.60, 3709.40, 3735.01, 3763.91, 3878.71 2). 
5. As the outer components of quadruplets behave in a normal 
manner I have looked for an inequality of intensity between these 
components. The field used was somewhat stronger than the one 
mentioned in § 4. There was a difference in the expected sense in 
the case of the lines: 
3466.01, 3475.61, 3705.73, 3722.73, 3872.65. 
Moreover 3466.01 and 3705.73 showed a displacement toward 
the violet of the mean of the outer components relatively to the 
mean of the inner ones. This result is confirmed, at least for 
3466.01, by an observation of Reese: “but the most careful 
measurements that I could make indicated a possibility that in the 
case of 3466.0 the mean of the inner pair is a trifle further 
toward the red than that of the outer pair ®).” Voret’s developments 
1) Proceedings Royal Academy Amsterdam, June 1898. Astrophys. Journal. Vol. 9. 
Jan. 1899. 
*) The wave-lengths of the spare-spectrum according to Exner and Hascuex, 
5) Notes on the Zerman-Effect. Johns Hopkins Un. Circular. June 1899, N°, 140, 
Phil. Mag. Sept. 1899. 
