389 
1908-9.] The Systematic Motions of the Stars. 
1 2. When the stars are arranged according to their type of spectrum the 
following table is obtained : — 
Limits of 
Proper 
Motion. 
Stars of Type I. 
Stream I. Stream II. 
Stars of Type II. 
Stream Stream 
IN dlllol • 
Stars of unknown Spectra. 
Stream Stream ^ e ^p er 
> 100" 
0 
1 
33 9 
10-1 
2 
25-6 
15-4 
0 
60"-99" 
3 
0 
35 0 
15-0 
8 
51-9 
34-1 
3 
50 -59 
0 
0 
16-2 
15-8 
4 
47-6 
24-4 
5 
40 -49 
4 
0 
39-2 
17-8 
4 
93-8 
54-2 
4 
35 -39 
4 
1 
32-6 
12-4 
1 
71-7 
31-3 
7 
30 -34 
4 
2 
44-7 
24-3 
3 
102-1 
56-9 
11 
27 -29 
4 
1 
27T 
13-9 
5 
75-9 
53-1 
4 
24 -26 
8 
3 
43-2 
17-8 
5 
95-2 
48-8 
9 
22 -23 
6 
2 
39-8 
16-2 
7 
82-6 
70-4 
10 
21 -22 
8 
4 
31-0 
12-0 
6 
70-7 
43-3 
6 
Total 
I 
41 
14 
342-7 
155-3 
45 
717-1 
431-9 
59 
The stars whose type of spectrum is known are in nearly all cases of 6 m, 5 or 
greater. A large proportion of the remaining stars are between 8 m 0 and 9 m 0. 
In the above table it may be noticed — 
(i) That no stars of Type I are moving in directions diverging more than 
60° from the directions of A and B. 
(ii) That the proportion of stars belonging to Stream I is large for Type I 
stars. This may be accidental, as there are few stars. Attention is 
drawn to it, as if it holds generally it will afford a partial explana- 
tion of the smaller ratios found for the stream velocities (3:2) here, 
as compared with the ratio (3:1) found by Eddington. 
(iii) The number of stars diverging more than 60° from A and B is smaller 
for the faint stars. 
(iv) A somewhat greater proportion of faint stars belong to Stream II. 
None of the differences referred to above are very striking. Generally 
speaking, the two streams consist of the same kind of stars. 
Incidentally, the relative number of stars of large proper motions 
belonging to the spectral types I and II is given in the above table. The 
numbers are as follows : — 
Proper Motion. 
Type I. 
Type II. 
>100" 
1 
46 
50"-100" 
o 
a 
94 
30"-50" 
15 
179 
20"-30" 
36 
224 
