OF ARTS AND SCIENCES. 



139 



" Oct. 8th. Comet just visible to the naked eye. The brighter por- 

 tion is very eccentrically situated with respect to the general mass. 

 The fan-shaped brush of light is very evident on the side towards the 

 sun, the angle of the sides opening by 75° or 80°. There is no other 

 appendage which can be called a tail. 



" Oct. 21th. The general mass of light is on the side of the nu- 

 cleus, towards the sun ; a faint ray, probably the commencement of 

 the true tail, is thrown out on the side opposite to the sun. 



" Nov. 3d. The comet shows a tail of 1° or 2°. The same re- 

 markable appearance of a double tail presents itself as in October. 

 It is plainly visible to the naked eye. 



'■^ Nov. bth. Star of comparison is double, distance 10" ; that north- 

 preceding is used. 



" Nov. 13th. Strong daylight ; comet shows an almost sparkling 

 central point. 



" Nov. 21s/. The comparisons with Mercury are corrected for re- 

 fraction and for the planet's motion in the intervals of transit. 



" Nov. 25th. The comet was caught sight of in the morning twi- 

 light at an altitude of about 3°, and immediately compared with «2 Li- 

 brae, which was near it. Fdur instrumental comparisons were obtained. 

 After correction for differences of refraction and allowing for the 

 comet's motion, the observed places of the comet differed among 

 themselves in A. R. by 0^ .7, and in Dec. by 13"." 



3. Observations on the Eighth Satellite of Saturn {Hyperion) made 

 at the Cambridge Observatory. 



" The sign + indicates that the satellite follows Saturn, and — 

 that it precedes the planet. Owing to the faintness of the new satel- 

 lite, the distances above given are liable to errors of observation, 

 afnounting to three or four seconds. It was found best to refer Hy- 



