1918. ] The Fifth Indian Science Congress. CXXV 
the simultaneous effects of the electric and magnetic fields on. 
the electrons of Voigt’s atom lead to the simple superposition 
of the Zeeman and the Stark effects. Garbasso has found 
n 
very successful theory of the Stark effect, based on Sommer- 
feld’s work while Bohr’s atomic model has yielded some 
interesting results. 
Some Correlated Phenomena. 
The discovery of solar magneto-optics by Hale has put into 
the hands of astronomers a very potent method of solar research. 
Stormer recently showed that while the Zeeman effect can be 
easily observed in the sun, there is no appreciable Stark effect. 
Deslandres explains the absence of the electric field by suppos- 
ing that the sun’s atmosphere is composed of different levels 
of opposite charges and that the Zeeman effect is perhaps due 
to galvanic and not to convection currents. 
are subjected to a slight pressure displacement. No close 
relation between this pressure-shift and the magnetic resolution 
The Spectroscopists have always held that the real clue to 
the atomic structure will be furnished by the study of spectrum 
és, and it is no exaggeration to say that every theory of 
atomic structure has received the greatest help from the facts 
i 
c . 
“en made in the elucidation of some of the most elusive and 
a. 
“ist starting from the inverse Zeeman effect modifi : 
*xtended the theory of Lorentz and showed that magnetic 
