CXxxil Journal of the Asiatic Society of Bengal. [N.S., XIV, 
of different elements are decomposed by the magnetic field in 
the same manner and, if drawn to the scale of the frequencies, 
the resolutions are identical. Runge stated that the complex 
magnetic resolutions are in simple relation with the normal 
value of e/m 
It may be mentioned here that the remarkable progress 
made in spectroscopy by the establishment of serial relations 
in spectrum lines by Balmer, Runge, Rydberg, Kayser, Paschen 
and Ritz and others has a very strong bearing on the magneti 
resolution of lines. 
between the different series of the same element indicate that 
the different emission centres have some dynamic coupling and 
X-ray spectra photographed and investigated by Moseley and 
others showed that the principal lines in the spectra of a large 
The Inverse Effect. 
_ The Inverse effect, i.e. the magnetic resolution of absorp- 
tion lines, is of great importance, firstly because it is easily 
intelligible and secondly because it has a direct application @ 
astrophysics. 
In this branch too Voigt has led the way, and as already 
hinted at, offered a theory consistent with observed facts. 
oe monograph gives all the important work done ™ 
ranch. 
? Hansen has recently carried out in Gottingen an elaborate 
investigation of the phenomena associated with the invert 
He has 
investigation of the Zeem in directions incline? © 
field and making an tile witb phe ier and vi : 
carried out a systematic study of this phenomenon. Voig ve 
Scherer have recently studied the magneto-optical absorpt | 
in a Na-vapour with circularly polarised light in @ © 
