90 Mr Dunlop's observations on the Comet of 1825. 



Nov. 1st — At 10 h 33' the comet pretty bright ; the tail 

 about 7° in length, and one half degree broad. About 1 \° from 

 the centre of the head the rays of the tail cross each other, 

 and diverge gradually to the extremity ; two branches shooting 

 out from the head, one on each side of the tail, and about 2° 

 in length. (See Fig. 13.) 



Nov. 2d. — At 10 h 5(y the tail is very bright, and about 7° 

 in length, with a branch on the preceding side, about 2° long, 

 and another on the following side, about 1J°. The tail is more 

 connected with the following side, which is the shortest ; also 

 on the following side of the head there is a quantity of thin co- 

 metic matter protuberant from the general round form of the 

 head. (See Fig. 14.) 



Nov. *7th. — At 8 h 5&, comet pretty bright ; can trace the 

 tail for nearly 9° in length ; the nucleus is very bright. Between 

 2° and 3° from the head the tail becomes very narrow. (See 

 Fig. 15.) The wing or branch on the following side is longer 

 and more detached from the body of the tail than that on the 

 preceding side. 



Nov. 8th. — At 9 h 46 7 the comet is very different in appear- 

 ance from last night, the head is not round, or at all formed, 

 it only resembles a blunt point, from which the tail gradually 

 spreads in breadth, and diminishes in density, but continues 

 bright at the sides, and dark in the middle from the head 

 through the whole length of the tail. A very faint cloudiness 

 surrounds the head, and extends along the tail on each side 

 about 2°. The length of the tail is about 10°, and 1° broad at 

 the extremity. (See Fig. 16.) 



The preceding is a copy of my Journal of Observations on 

 the comet, and also on the changes which I observed to take 

 place in the figure of the tail. 



The different appearances which it presented are worthy of 

 attention, and I trust these observations will be of service to 

 compare with similar observations made in Europe, and also at 

 the Cape of Good-Hope. 



By comparing the annexed figures, (which were drawn with 

 care, and afterwards compared with the comet,) a periodic re- 

 turn may at least be suspected. Figures 1, 6, and 10, are 



