VOL. XL.] PHILOSOPHICAL TRANSACTIONS. 154 



The difference of right ascension and declination, between this star and the 

 comet, was taken with a 15-foot telescope ; but the place of the star was deter- 

 mined by one observation made with the 7-foot tube. 



February 27, 8^ 45'", the comet preceded a small star, l" l6'0' in right 

 ascension, and was 2' 15" more southerly. The right ascension of this star was 

 afterwards, by a single observation, found to be 44° 37' 40", and its declination 

 5° 38' 30* north. Hence the comet's right ascension was 43° 2l' 40", and its 

 declination 5° 36' 15* north. 



March 4, S** O™, a small star, whose right ascension was found to be 49° 

 30' 30", and its declination 6° 38' 30" north, preceded the Comet 7' 30* in 

 right ascension, and was lO' O" more southerly. Hence the right ascension of 

 the Comet was 49° 38' 0', and its declension 6° 48' 30". 



March 12, 6^ 25™, the Comet preceded /* Tauri 2° 5' 50' in right ascension, 

 and was 4' 25" more northerly than the star. Hence the Comet's right ascen- 

 sion was 58° 12' 40", and its declination 8° 16' 30* north. 



March 14, 9'' O™, the Comet followed the 47th star of Taurus in the British 

 catalogue 12' 30" in right ascension, and was O' 15" more northerly than the 

 star. Hence the Comet's right ascension was 6o° 8' b", and its declination 

 8° 34' 5" north. This, and all the following observations, were made with a 

 good 1 5-foot telescope, the Comet now appearing too faint to be well observed 

 with the 7-foot tube. 



March 17, S'' 40™, the Comet followed y Tauri 25' 5" in right ascension, 

 and was 9' 40" more northerly. Hence its right ascension was 62" 47' 55", and 

 its declination 8° 58' 45'" north. 



March 1 9, 7*" 50™, the Comet followed the same star 2° 4' 50" in right 

 ascension, being 23' 55'" more northerly. Hence its right ascension was 64° 

 27' 40"", and declination 9° 13' O* north. 



The same night, at 9** O™, the Comet preceded d Tauri 47' 40'" in right 

 ascension, and was 22' 50'" more southerly. Hence its right ascension was 

 64° 30' 20", and declination 9° 12' 35" north. 



March 20, S*" 5™, the Comet preceded d Tauri O' 30'" in right ascension, 

 and was 16' 35" more southerly than the star. Hence its right ascension was 

 65° 17' 30", and declination 9° 18' 50"" north. 



March 22, 8'' 13'", the Comet followed the same star 1° 36' 10" in right 

 ascension, and was 3' 30" more southerly. Hence its right ascension was 

 66° 54' 10", and declination g° 3l' 35' north. 



This was the last night that he saw the Comet; for the moon being then in 

 her increase, entirely obstructed its further appearance. The light of the 

 Comet was indeed, even in the moon's absence, so very weak, that he found 



