290 
ASTRONOMY: C. D. PERRINE 
TABLE I* 
Arranged according to proper motion 
B-B5 { 
B8-B9. 
Bulletin, Nos. 
B-B5. 
MEAN 
MEAN 
MEAN 
NUMBER 
A* 
JiAGNITUDE Vl 
V 
STARS 
km. 
km. 
0:000 to 0:009 
4.0 
6.2 
8.9 
38 
0.010 0.019 
4.5 
7.9 
7.6 
44 
0.020 0.029 
4.2 
6.7 
8.9 
28 
0.030 0.049 
3.9 
5.5 
8.0 
49' 
0.050 0.119 
3.7 
4.4 
6.0 
23 
0.000 to 0.019 
4.2 
4.4 
3.1 
9 
0.020 0.049 
4.8 
6.7 
7.2 
16 
0.050 0.099 
4.6 
7.8 
6.8 
17 
0.100 0.180 
3.0 
11.1 
6.6 
3 
0.000 to 0.020 
4.5 
10.1 
31 
0.021 0.050 
4.6 
12.4 
47 
0.051 0.099 
4.5 
11.1 
60 
0.100 0.199 
4.1 
10.4 
53 
0.200 0.656 
3.0 
10.1 
18 
are based upon Campbell's catalogs of B and 
A class stars in Lick. 
) and 211. 
TABLE II 
Arranged 
according to radial velocity 
V2 
MEAN 
MEAN 
NUMBER 0 
MAGNITUDE 
M 
STARS 
km. km. 
Oto 2.9 
3.8 
0.031 
58 
3.0 5.9 
4.0 
0.024 
47 
6.0 9.9 
4.2 
0.025 
42 
10.0 19.9 
4.4 
0.029 
24 
10.0 19.9 
4.4 
0.025* 
23 
20.0 25.6 
4.6 
0.024 
9 
Oto 5.0 
4.3 
0.083 
68 
5.1 9.9 
4.2 
0.104 
49 
10.0 14.9 
4.3 
0.091 
31 
15.0 19.9 
4.4 
0.112 
27 
20.0 29.9 
4.1 
0.074 
27 
20.0 29.9 
4.5** 
0.066 
22 
30.0 35.5 
4.7 
0.068 
8 
Ohs. 
* Omitting one large value. 
** Omitting five bright stars. 
TABLE III 
CLASS B-B5 
CLASS A 
Number of 
Mean 
Number of 
Mean 
stars 
stars 
1 . 9 and brighter 
11 
oro5i 
8 
0^382 
2.0to2.9 
18 
0.033 
19 
0.177 
3.0 3.9 
38 
0.028 
26 
0.093 
4.0 4.9 
88 
0.024 
121 
0.075 
5 . 0 and fainter 
24 
0.025 
38 
0.066 
