39 
taken place ; but as some of the well-known periodical vari- 
ables occasionally exhibit an equal, and even a greater, rapidity 
of change, this view cannot at present be received with 
much confidence ; and notwithstanding the remarkable and 
highly interesting conclusions which Mr. Huggins and Dr. 
W. A. Miller have drawn from the results of their spectro- 
scopic observations of this new variable, we are constrained 
to admit that the cause of variability is still involved in the 
deepest mystery. 
The following table contains the positions and magnitudes 
of the stars with which I have compared T Coronse in the 
course of its changes. The positions are from the “ Bonner 
Sternverzeichniss,” and the magnitudes are from my own 
observations. The magnitudes of some of these stars have 
been determined independently by Mr. Knott, F.RA.S., and 
it is satisfactory to me to find that our results are almost 
identical. 
No. 
Star. 
I 
R. A. 
1855-0. 
Dec. N. 
1855-0 
1 
Magnitude. 
1 
3 Serpentis. 
15 h 
39 m 
29-3 s 
15° 
53-1' . 
3-7 
2 
y Herculis . 
16 
15 
31T 
19 
30-3 
3-8 
3 
y Coronee . 
15 
36 
40*0 
26 
45-6 
4-2 
4 
e Coronae . 
51 
35*7 
27 
18-1 
4-3 
5 
h Coronae . 
43 
31-0 
26 
31-5 
4*8 
6 
7 r Serpentis . 
56 
3*5 
23 
12-3 ! 
4-8 
7 
i Coronae 
55 
38-2 
30 
15*1 1 
5-1 
8 
25 Herculis. 
16 
20 
14-8 
37 
42-7 i 
6*0 
9 
Arg. 2575 + 
27° 
15 
56 
38*2 
27 
M 1 
7‘5 
10 
3009 
25 
53 
23-8 
25 
51T 
7-6 
11 
2767 
26 
55 ' 
2*8 
26 
34-6 
7-7 
12 
2762 
26 
52 
32-8 
57 -2 
7-9 
13 
2754 
26 
49 
16-8 
26-3 
8-0 
14 
3003 
25 
52 
39-3 
25 
59*5 
8-1 
15 
2563 
27 
52 
30-0 
27 
16-8 
8-1 
16 
2769 
26 
55 
28-9 
26 
48*0 
8-4 
17 
2763 
26 
52 
54-1 
33-6 
9-0 
18 
2758 
26 
51 
49-5 
9-9 
9*2 
19 
2760 
26 
52 
7*3 
40-0 
9-4 
20 
2761 
26 
52 
25*4 
21-2 
9*6 
21 
2764 
26 
53 
22-3 
33-9 
10-8 
