of the variable Star in Sobieski's Shield. 
Table X. 
143 
The observed middle Times of 
its least Brightness. 
Apparent 
Rotations 
in Days. 
Remarks, 
chiefly to illustrate some of the 
Observations. 
1796. March 4 - j 
6? 
May 10 
} 
July 19 - 
September 3 
7 ° 
4 6 
The decrease of July 19 being so very 
{ slight, I for a long time omitted it, and 
J took the interval from May to September 
\ of 116 days as a double revolution, but 
j have here preferred the separate ones of 70 
''-and 46 days. See Phil. Trans. 1797. 
October 22 - 1 
49 
1797. July 10 - | 
67 
September 15 
November 6 I 
52 
1798. July 10 - | 
67 

September 15 
November 10 j 
56 
1 799 - J u ty 4 - 1 
September 16 
74 
f The increase and decrease observed by a 
\ succession of good observations. 
November 5 : - j 
50 
1801. Middle of June : : 
August 2 1 - 
October 16 - ^ 
5 6 
It thus appears, that the periodical returns of bright- 
ness are uncommonly fluctuating, and that the differences 
between the extremes are very considerable ; to account for 
which, I shall presume to offer the following explanations, 
