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the comet with the micrometer adapted to the New- 
tonian telercope, and I found it 2 min. and I 
likewife determined the magnitude of the nucleus, 
which I found to be 20'', having compared it with 
the thicknefs of one of die threads of the microme- 
ter, which I afterwards reduced into parts of the 
micrometer. The twilight was then fuch as to fa- 
vour this meafuring and the other obfervations. 
The 2d the clouds prevented my feeing the co- 
mer, but the 3d, about feven o’clock, the fky being 
tolerably clear, the comet appeared, though but 
faintly, by reafon of its nearnefs to the horizon and of 
the light of the moon ; however, I compared it with 
a ftar of Pifces that is to be found in Flamftead’s 
catalogue. It is the 8th of that conftellation, marked 
with the Greek letter y!. The pofition of this ftar 
for the prefent time is ftiewn in the firft table. 
The 4th I was as much hindered as the night 
before by the comet’s nearnefs to the horizon, and 
by the too great light of the moon, which made 
it impotfible to judge of its increafe. I compared 
the nucleus with the fame ftar y of Pifces. 
From the 4th to the i ith it was utterly impoflible 
to make any obfervations, or even to fee the comet, 
by reafon of the clouds which darkened that part of 
the fky at the time it fhould have appeared. The 
nth the ftcy was clear in the evening. I faw the 
comet, which was but io° high, fo that I could not 
judge of its appearances, from its nearnefs to the 
horizon, and the ftrong light of the moon, which 
was then at the full. 1 was likewife much obftruefted 
by the height of the chimnej's which ftand between 
the horizon and the marine Obfervatory to the Weft. 
4 This 
