THE GREAT COMET. 
115 
It may be mentioned, in conclusion, that no signs of polarity 
could be perceived in the light of the comet, although experi- 
mented on with the most delicate instruments by Sir John 
Herschel. Neither could the slightest image be perceived on a 
highly-sensitized collodion plate, although Mr. T)e la Rue, who 
endeavoured to procure it, was able to obtain it in the case of 
Donates comet of 1858. 
The comet is still visible in the northern heavens, although, 
from its great distance from the earth, powerful instruments 
must be used in order to catch a glimpse of it. Its distance on 
Sept. 28 is 205 millions of miles, and it is situated at R. A. 
16h. 9m., and 48° 14' of north polar distance, according to the 
foregoing orbit which I have calculated. 
O o 
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