38 
Intensities op the Light op T Cobon^: : — 
Date. 
Mag. 
Intensity, 
10 mag. 
being=ro 
Date. 
Mag. 
Inten- 
sity. 
Date. 
Mag. 
Inten- 
sity. 
1866. 
May 15 
3*7 
331*2 
June 17 
9*5 
1*6 
Sep. 17 
7*9 
6*9 
16 
4*2 
209*0 
19 
9*5 
1*6 
22 
7*9 
6*9 
17 
4*9 
160*0 
25 
9*6 
1*4 
24 
7*8 
7*6 
18 
5*3 
75-8 
26 
9*7 
1*3 
30 
7*8 
7*6 
19 
5*6 
57*5 
July 11 
9*7 
1*3 
Oct. 1 
7*7 
8*3 
20 
6*2 
33*1 
16 
9*7 
1*3 
6 
7*6 
9*1 
21 
7*1 
14*4 
19 
9*6 
1*4 
8 
7*6 
9*1 
22 
7*4 
11*0 
20 
9*7 
1*3 
10 
7*5 
10*0 
23 
7*5 
10*0 
21 
9-6 
1*4 
14 
7*5 
10*0 
24 
7*7 
8*3 
22 
9*5 
1*6 
19 
7*7 
8*3 
25 
7*8 
7*6 
30 
9*7 
1*3 
28 
7*8 
7*6 
26 
8*0 
6*3 
Aug. 20 
9*8 
1*2 
Nov. 6 
7*9 
6*9 
29 
8*4 
4*4 
27 
9*5 
1*6 
19 
8*3 
4*8 
June 8 
9*3 
1*9 
31 
9-3 
1*9 
10 
9*2 
2*1 
Sep. 14 
7*9 
6*9 
16 
9*4 
1*7 
15 
7*8 
7*6 
The outburst of T Coronse appears to have been first 
observed by Mr. J. Birmingham, of Tuam, on the night of 
May 12, when its brightness was equal to, if not greater 
than that of « Coronse, the magnitude of which is 2 *6. The 
relative intensity of the light of the variable on that night 
was therefore not less than 912*1. Comparing this with the 
intensities in the above table it will be seen that during the 
first ten days of the star’s appearance its light diminished 
with extraordinary rapidity, the intensity on the 22nd May 
being only 11*0 against 912*1 on the 12th when first seen 
by Mr. Birmingham, and 331*2 on the 15th when first seen 
by myself. Since the 22nd of- May its changes have been 
comparatively slight. On the 20th of August the intensity 
was at a minimum, being only 1*2, or rioth of its amount 
on the 12th May. 
An inspection of the curve of intensities suggests strongly 
the idea that a force of an explosive character, such as 
could result only from the action of highly elastic gaseous 
matter, had been in operation to produce the sudden increase 
and subsequent rapid diminution of brightness which had 
