88 Mr Dunlop's observations on the Comet o/1825. 



out from the head about one degree in length. The tail is near- 

 ly a straight line from the head to where the branches separate, 

 when it curves off suddenly concave on the following side. 

 (See Fig. 6.) 



At 9 h 20' mean time, the general appearance much the same 

 as at 8 h 10'. The faint narrow branch preceding is rather fainter 

 at the extremity, and the nebulosity or branch on the following 

 side is much brighter, and about a degree and a half in length ; 

 also on the preceding side of the head a new branch is growing 

 out. This side of the tail is not so sharply denned as at last ob- 

 servation ; the head is bright, but the tail is fainter towards the 

 extremity. (See Fig. 7.) 



At 10 h 25', the collecting matter has extended at least 2° 

 on the following side, is considerably broader, and appears se- 

 parating to form another branch ; also the formation of another 

 branch on the preceding side is rapidly advancing, and the ne- 

 bulosity is extending to a greater distance round the head. 



At 12 h 0', the general appearance much the same as at last 

 observation. The following new branch is about 3° in length, 

 and the preceding fully 1 1° ; they are not yet separated from 

 the principal branch or tail. The head is certainly not so much 

 condensed, or so bright ; the tail, also, is fainter than it was 

 early in the night ; it appears, as it increases in length and 

 breadth, that the cometic matter becomes more thinly spread, 

 and no new supply of luminous matter ; the head is larger, but 

 sensibly less condensed near the centre. 



At 18 h 0', the head and tail much broader and fainter, the 

 branches shooting out on each side from the head, are evidently 

 formed, and beginning to be detached from the body of the 

 tail. The narrow and condensed tail from the head to where the 

 original branches separate, is now a broad, faint, gradual light, 

 about 25' broad. 



The tail is about 11° in length, and 3° broad at the extremity 

 of the original branches, but it is not so much curved as it was 

 early in the evening. (See Fig. 8.) 



Oct. 15th. — At 9 h 5' mean time, the tail runs out straight 



from the head about 11° or 12° in length, with three branches 



on the following side, and a new branch is shooting out from 



the head on the preceding side. 



At 10 h 15', general appearance much the same; the new" 



