made with a View to investigate its Magnitude , See. 151 
apparently of the size of the planet Jupiter, when it is viewed 
with the sane telescope and magnifying power. 
With a good telescope, I saw in the centre of the head a 
very small well defined round point. 
Nov. 20. The head of the comet is now less brilliant than 
it has been. 
Of the Coma of the Comet. 
The coma is the nebulous appearance surrounding the 
head. 
Oct. 1 9. By the field of view of my reflector, I estimate the 
coma of this comet to be about 6 minutes in diameter. 
Dec. 6 . The extent of the coma, with a mirror of 24 inches 
diameter, is now about 4' 45". 
Of the Tail of the Comet. 
Oct. 18. 7 h . With a night glass, which has a field of view 
of nearly 5 0 , I estimated the length of the tail to be 3°^ ; but 
twilight is still very strong, which may prevent my seeing 
the whole of it. 
Nov. 20. The tail of the comet is still of a considerable 
length, certainly not less than 2^- degrees. 
Oct. 26. The tail of the comet is considerably longer on 
the south-preceding, than on the north-following side. 
It is not bifid, as I have seen the comet of 1769 delineated, 
by a gentleman who carefully observed it.* 
Oct. 28. 7-feet reflector. The south-preceding side of the 
tail in all its length, except towards the end, is very well 
defined ; but the north-following side is every where hazy 
* Dr. Lino of Windsor. 
