C 313 ] . 
naked eye. I compared the nucleus with fonie very 
rmall ftars, one of which I found by comparing it 
with fome ftars of the fextant. The pofition for 
the prefent time ftands in the firft Table N° 8. 
The 14th clear at night, I faw the comet with 
the naked eye before the moon was up j it was ftill 
equal to the ifars of the 4th magnitude. I deter- 
mined the apparent diameter of the nucleus, which 
I found to be 27 feconds, by comparing it with the 
thicknefs of one of the threads' of the micrometer, 
which was adapted to the Newtonian telefcope. I 
then compared the comet with lev^eral ffars, namely 
with tv/o new ones, which may be feen in my firft 
Taole N° 6 and 7, and with the 22d of the fextant 
in Flamftead’s catalogue. 
The 15th the iky was quite clear at night. I faw 
the comet very plain by the naked eye, but could 
perceive no tail 3 but I obferved one in looking through 
a refracting telelcope one foot long, made of convex 
glaffes, which is very clear, and difcovers a great 
compafs of the fliy. I made ufe of it to find out the 
flars which correfponded with the extremity of the 
tail, and then I determined the pofition of thefe 
ftars with the comet, by means of the micrometer 
adapted to the telefcope, which gave me the length 
and direction of the tail. I found it to be 3"^ JL long. 
This tail was not vifible with the reflecting telefcope, 
no doubt by reafon of its too great magnifying powerj 
it only fliewed a round and indeterminate light fur- 
rounding the nucleus of the comet. I compared 
the nucleus with the 2 2d flar of the fextant ; the po- 
fition of this fl:ar may be feen in the firfl Table. 
S f 
VoL. LV, 
The 
