1918.] The Fifth Indian Science Congress. Cxix 
the principal line and are periodic in occurrence, indicating 
he observation of the Zeeman effect of these satellites 
has always been a fascinating study as likely to give a clue to 
the mechanism of radiation and the production of spectrum 
lines. Mercury lines being easily observed, have been inves- 
and have shown that the separation of lines is not generally 
subject to the law of linear proportionality to the magnetic 
field (as expected from the simple theory of Lorentz) including 
the singular case in which change of wave length is proportional 
and shows many of the results to be consistent with Voigt’s 
theory of the vibrations of electrons in an isotropic, quasi- 
elastic electric field. . 
: ouston’s suggestion as to the origin of the satellites is an 
interesting one. He thinks that satellites may in some cases 
be caused by sudden changes of amplitude or phase in an oscilla- 
tor of one definite period. 
The writer employing a Wehnelt cathode lamp as the 
source of bright-fine arc lines in vacuum an using a powerful 
Echelon grating, observed Zeeman effect of the satellites of 
‘Separation from the law of linear proportionality. In some 
“4ses, notably with the six satellites of the bismuth blue line, 
+ Veritable ‘dance’ of lines in the magnetic field was observed. 
“saoka and Takamine are continuing their investigation of 
the satellites, | 
. Apart from these anomalies, several satellites resolve into 
8 ge quadruplets, sixtuplets and follow Runge’s rule. The 
