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A full defcription of this method is to be found 
in an ample memoir concerning this comet, which I 
have laid before the Royal Academy of Sciences at 
Paris, and which no doubt will be printed in their 
collection, together with a northern hemifphere, by 
means of which I have been enabled to look for 
this comet in the very place of the fky, where it 
ought to appear j and it was by the help of this 
planifphere that I actually difcovered the comet from 
the marine Obfervatory at Paris on the 21ft of Janu- 
ary in the evening, after fearching for it two years 
fuccellively whenever the fky would permit. The 
weather was extremely clear the 21 ft of January the 
whole day and evening. I feized this opportunity,, 
and as foon as the ftars were vifible after fun-fet, I 
examined, thro’ a Newtonian telefcope of four feet, 
and a half, thofe places of the flcy, where my plani- 
fphere fhewed that the comet was to be expeCted. 
After much pains, I perceived about feven o’clock a 
light refembling that of the comet I had obferved the 
year before in Auguft, September, October, and the 
beginning of November I immediately made a 
configuration of this new light wdth relpeCt to the 
neighbouring ftars, in order to examine the next 
night w'hether it had had any motion among the fixed 
ftars. This light appeared pretty large ; and in the 
middle I obferved a nucleus, or bright fpot, which 
was no proof as yet that it was a eomet, as there are 
fome nebulous ftars, with a bright fpot in the middle. 
By the drawing I took of this new light with refpeCt 
to two neighbouring ftars, one of which was the 
1 8th of Pifees, according to Flamflead’s Catalogue, 
* See Mem. dc I’Acad. Roy. des Scicnc. An. J759. 
2d 
