Ill 
I have not observed S Coronse when at its minimum 
brightness, and cannot therefore give the lower limit of its 
range of variation, nor the interval from minimum to maxi- 
mum. My observations show, however, that it belongs to 
the list of variables which increase in brightness more rapidly 
than they diminish. Thus in 1864 it rose through 4 5 
magnitudes in 78 days, but fell through only 1*5 magnitudes 
in 80 days ; and in 1865 it increased 5*3 magnitudes in 106 
days, but diminished only 2 0 magnitudes in 118 days. 
The place of S Coronse for 1865*0 is 15 h. 15 m. 54"6 s. 
-j-31°5r2 / . The calculated time of its next maximum is 1866, 
July 17 ; and for the convenience of observers who may be 
disposed to watch its changes and record their observations, 
I append to this communication a small chart, and a list of 
comparison stars with their magnitudes. 
XV. hours. 
+ 31 ° 20 ' 
-f 31° 40' 
4 32° O' 
4- 32° 20' 
14 m. 16 m. 18 in. 
£ 
4 31 ° 20 ' 
+ 31 ° 40 ' 
4- 32° 0' 
4 32 ° 20 ' 
MAGNITUDES OF COMPARISON STARS. 
a = 6*8 
d = 
8-6 
<7=11-3 
6 = 7-9 
e = 
8-8 
A = 11 *9 
00 
II 
O 
/= 
10-2 
k= 12-6 
