the changeable Stars . ipp 
Thefe being compared to limilar obfervations of Sept, iz 
and 19, 1784, make the length of a Angle period thus : 
I 
H. 
M. 
7 
4 
I 2 
7 
4 
19 
7 
4 
l 7 
7 
4 
22 
7 
4 
7 
7 
4 
12 
7 
4 
15 on a mean 
I fee no reafon to alter materially the other points; but be* 
lieve them more exaft thus : 
40 hours at its greateft brightnefs. 
66 . — _ in decreafing. 
30 — — at its leaft. 
26 ■ — in increafing* 
It alfo, in every period, feems to attain the fame degree of 
brightnefs when at its full, and to be equally decreafed. 
Variable in the Swan s Neck. 
During thefe three years I have obferved this ftar with par- 
ticular attention, as may be feen by the obfervations that con- 
clude this Paper, and determined the middle time of its greateft 
brightnefs very exactly, thus : 
1 783, July 9, of the 6 . 7th magnitude. 
1784, Aug. 4, of the 5 , 6th — — 
1285, Sept, i, of the 6th - 
The, 
