( 588 ) 
The upper and lowest stripes show the influence 
i _ i of polarized light on the phenomenon. 
I The observations given in this communication 
1 have been made by the described method. By 
Fig 2. its use all particulars of the phenomenon are 
simultaneously exhibited; we also succeeded in photographing the 
essential points. Examples of our photographs are given on the plates 
annexed to our paper. 
6. If the absorption lines are not narrow or if the magnetic field 
is weak, the components of a magnetically divided line will partially 
overlap. This partial superposition is the cause of some particularities, 
especially manifest in the inverse effect and probably also apparent 
in sun-spot spectra. 
The nature of these particularities may be illustrated by a few 
examples. We will consider the case of the magnetic triplet and 
the magnetic'doublet. 
In Fig. 3 the curves show the distribution 
of intensity of the three components of a 
triplet, if the light is examined at right angles 
to the lines of force. If natural light traverses 
a source of light placed in a magnetic field, 
two black bands are seen, corresponding to 
the wavelength, for which vertical as well as 
horizontal vibrations are absorbed. 
These black bands are surrounded by less 
dark parts, which absorb only one of the 
Fig. 3. principal vibrations, the , other proceeding 
unimpeded, (cf. ty 3 and 4). 
If now a Nicol with its plane of vibration vertical, is introduced 
two -black bands are again seen. The darkest part of these compo¬ 
nents corresponds to the maximum of the 
curves relating to vertical vibrations. 
As a general rule the distance of the com¬ 
ponents exceeds that of the lines first considered. 
7. Parallel to the lines of force a partial, 
not too small, overlapping of the components 
produces a black line limited by two less dark 
parts. This case is illustrated diagrammatically 
in Fig. 4. 
The two components may be separated by 
a circular analyser. 
These considerations may be applied to the magnetic division in 
