[ 6 1 ] 
fccond edition of his catalogue, makes of the 3d 
magnitude. I feveral times compared the nucleus of 
this comet with this ftar, to deduce its pofition. The 
next day, being the 9th, the fky appearing perfectly 
ferene without a moon, I began to fee the comet a 
few minutes before 8 o’clock. During one hour, it 
was diftindtly feen with the naked eye, the tail was 
6° or 7 0 in length, the nucleus very bright. I meafured 
its diameter, by comparing it with the thicknefs of 
one of the threads of the micrometer of my inftru- 
ment, and found it about 36" of a degree. On the 
10th, the fky being equally bright, I law the comet 
fome minutes before 8 o’clock, and between 8 and 9 
it was feen with the naked eye, with a longer tail than, 
yefterday, but not fo didindt ; the nucleus had alfo loft 
part of its brightnefs. On the 1 ith, the fky being 
clear as the preceding days, the comet could only 
with difficulty be feen with the naked eye ; its appear- 
ances were much lefs diftindt than the day before, 
both on account of the vapors of the horizon where it 
was, and of the twilight which was conliderable, and 
ftill more fo by the light of the moon, which, as well 
as the two preceding days* was in the part of the 
heavens, where the comet appeared. On the izth, 
the comet could no longer be feen with the naked 
eye. Through the telefcope it appeared very faint, 
the tail not exceeding now one degree and a half. It 
certainly became thus invilible, as well as the nucleus, 
through the too great power of the twilight. The 
13th, the fky was ferene, with fome clouds towards 
the horizon ; I looked for the comet, but could not 
find it, fo that the evening of the 12th was the period 
of its vifibility. 
5 ' • 
Table 
