1918. j The Fifth Indian Science Congress. Cxxvii 
ing Bohr’s eg and the Quantum hypothesis, there is no 
place left for the quasi-elastic oscillating electrons which func 
tion as energy sources for the series lines, although used in all 
theories for the explanation of the Zeeman effect from Lorentz 
to Voigt. 
Conclusion. 
Thus in tracing the recent progess in a single branch of 
physics, we see how the various mysteries are gradually being 
solved and how knowledge advances by slow steps. The various 
anomalies and complexities defy our attempts but do not lessen 
our confidence in the ultimate success of our pursuit. Science 
believes in Tyndall’s ery of ‘‘ Commotion before stagnation, the 
eap of the torrent before the stillness of the swamp ’’—and 
makes and unmakes theories every day to explain the observed 
facts and to predict results never observed before. And in 
eatehing a glimpse of the sub-atomic world through the window 
thrown open by the study 7 a optics, we realize the 
truth of the saying of Senec 
“Nature does not alice us to explore her sanctuaries all 
tonce. We think we are initiated but we are still only on 
the threshold.’’ 
On the displacement of the lines in the Solar spectrum 
towards the red.— By J. EvERSHED 
Eo The want of exact coincidence ay ere the hoe cs in solar and 
terrestrial spectra was first observed by Rowland, and this was later 
a as due to a pressure in the saveeded layer of npr: six atmos- 
"When light from different parts of the sun’s disc ise —— it is 
eentie of he "pene of the lines progressively increase fi _ 
com ee the disc t to any point on the limb, where the displacemen 
of dis thats the lines in terrestrial spectra is grea a 
but the ment at the limb has also been attributed to pressure: aitere 
® Kodaikanal resear ches es prove that this is not a pressur 
disc FeerPreting the shifts, both mA the limb and at the cen he 
motion only, the ag et has to be faced that it involves 
rd a ar gases b 
2 
& 
og "ier 3 
"Oo 
j—] 
2s 
gs 
h 
| anal sta da “tom in the opposite sense and varying as 
e oie: as there are anding 
mbin give 
Plete ex la 
= oa Pp ation of th 
ts at the ® limb which cannot be due to -elativity alone. aie large 
