i9o8.] OF DANIEL'S COMET. 7 



II the mass (if the same) had increased its distance from the head 

 by about 20'. In the meantime it had drifted sunward 1° 10' — fol- 

 lowing in the direction of the comet's motion. It is probable that 

 this was due to its original motion when a part of the comet, and 

 that if its existence had been permanent enough, the motion would 

 have become one of recession from the sun, but it rapidly dissipated 

 before other photographs could be made of it. 



With the aid of the BD charts I have taken off the following 

 positions on the photographs of July 11 : 



Position of the Head 1855.0. Position of the Condensation 1855.0. 



Juvisy, i" 48" .05 + 8° 12' i'' 44"\o + 7° 54' 



Yerkes, i" 49'".50 + 8° 19' i" 45'".o + 7° 53' 



Lick, i" so^.05 + 8° 18' i" 45"'.o + 7° 54' 



The position angles of the mean axis of the tail on this date are: 



If one should take the brighter, long part of the tail, independent 

 of the head, the axis of it would pass a little north of the head. 



The following positions were taken off by the aid of the BD 

 charts on the plates of July 19. 



Juvisy. — Position of the head 1855.0 2'' 40'".5o + 11° 29'. Posi- 

 tion angle of the middle long, bright branch of the tail 249°. 2. The 

 main or central branch separates at 2>7'-7 back of the head. The 

 south branch of the tail is 5° less in position angle than the 

 middle one. 



Yerkes. — Position of head 1855.0 2'' 42"'.67 + 11° 33'. Position 

 angle of main branch of the tail (n. of 2) 253°. 5. The south one 

 was in P. A. 250°, but was irregularly curved. 



Lick. — Position of head 1855.0 2^ 42"\5o-f-ii° 32'. Position 

 angle of main and largest branch 252°. 9. 



The following are the positions on August 11, derived from the 

 charts. 



Juvisy. — Position of head 1855.0 6*^ 4'".7o + 17° 23'. Position 



