ASTRONOMY: ADAMS AND SHAPLEY 
141 
The mean value of the velocity as derived from the lines of large 
pressure shift is 1.58 km greater than that from those of small shift, 
and it is noteworthy that not one of the velocities of the Hnes in the 
latter group reaches the mean value for the large shift lines. Similarly 
only two of these reach values as low as the mean for the lines of small 
pressure displacement. 
The photograph taken near the star's minimum shows similar results, 
although it is entitled to considerably less weight because of its quality 
and the fact that but a single measurement has been made upon it. 
TABLE I 
Small pressure shift 
A 
V 
A 
V 
LINE 
A 
KM 
LINE 
A 
KIC 
4250.9 
+0.001 
-20.1 
4415.2 
+0.004 
-20.4 
4271.9 
0.001 
18.9 
4422.7 
0.001 
21.2 
4325.9 
0.002 
21.2 
4466.7 
0.003 
19.5 
4352.9 
0.002 
19.6 
4442.5 
0.005 
19.6 
4376.1 
0.002 
18.3 
4482.3 
0.003 
20.1 
4383.7 
0.003 
20.0 
4531.3 
0.003 
18.3 
4404.9 
0.004 
19.9 
Mean 
+0.0027 
-19.79 
Large pressure shift 
A 
V 
A 
V 
LINE 
A 
KM 
LINE 
A 
KU 
4222.3 
+0.007 
-20.8 
4271.3 
+0.008 
-22.6 
4227.6 
0.017 
24.0 
4407.8 
0.012 
20.6 
4233.7 
0.006 
20.3 
4430.7 
0.007 
19.6 
4236.1 
0.007 
23.7 
4447.8 
0.006 
19.4 
4238.9 
0.012 
22.5 
4494.7 
0.007 
20.5 
4250.2 
0.011 
21.5 
4528.7 
0.006 
21.7 
4260.6 
0.010 
20.5 
Mean 
+0.0090 
-21.37 
Combining the results with weights of two and one we obtain the fol- 
lowing value for the difference in velocity: 
Large A lines (+-0.009 A) - Small A lines (+0.003 A) = -1.22 km 
The sign of this difference is opposite to that which would be found if 
pressure is the agent producing it and if the effective pressure at the 
star's surface where these Hnes are formed is greater than one atmos- 
phere. It is, however, the sign which would be found if the stellar pres- 
sure is less than one atmosphere. In that case the iron comparison lines 
on the negatives, which of course are taken at atmospheric pressure, 
