1114 
according to the dispersion theory, the asymmetry of the Fraunhofer 
lines originates, we drew up a scheme of criteria which a line and 
its surroundings would have to answer for giving reason to expect 
either an increase or a decrease of its displacement towards the red, 
owing to neighbour lines. In the tables containing the selected lines 
(which will be printed in the Astrophysical Journal) we have men- 
tioned the criteria and considerations applied with each line, as well as 
the direction of the expected effect. Next to these data will be found 
the actually observed displacements, under one of the headings d, 
or d, according as a repulsion from the violet or from the red side 
(i.e. an increased or a decreased amount of displacement towards 
the red) was expected. 
MOUNT WILSON KODAIKANAL 
| 0.015 
| 
| 0.010 
10.005 
0 
4000 5000 6000 4000 5000. + 6000 AE. 
In the diagram abscissae represent wave-lengths, ordinates displa- 
cements, positive when towards the red. The values of d, are cha- 
racterized by full dots, the values of d, by circlets. 
We have kept the Mount Wilson data separated from te Kodai- 
kanal data in order to asceriain whether these two mutually inde- 
pendent series of observations would yield similar results. 
The outcome is very convincing: in both cases the full dots average 
decidedly higher than the circlets, which means that the displace- 
ment towards the red is generally greater for lines with companion 
on the violet side than for lines with companion on the red side. 
We need not wonder at finding some full dots yet to lie low and 
