OF AN EIGHTH SATELLITE OF SATURN. 277 



following measures from the object in question, which, for con- 

 venience, we shall designate by x. 



1848. 

 " Sept. 19th, at 9h. 40m. x precedes lapetus 137 



lapetus precedes star 344" 



*•" ^ 



" 12h. Om. X precedes lapetus 141" 



lapetus precedes same star 366" 



Measured in 

 the direction of 

 the plane of the 

 ring. 



" 13h. 15m. X precedes lapetus 143" 



lapetus precedes same star 375" 



" These measures indicated that the suspected body partook 



of the retrograde motion of Saturn. 



" ' Sept. 19th, at 13h. 30m. x follows Saturn's centre 256", in the direction of the 

 plane of the ring.' 



" A map of the stars in the path of Saturn for the two fol- 

 lowing nights was made, as a security against mistakes. 



" The evening of the 20th proved cloudy. 



" On the 21st the new satellite was compared with a star 

 following it near the plane of the ring : — 



Sept. 21st, llh. 34m., Distance of x from the star, 276". 

 12h. 11m., " " " 284". 



12h. 57m , " " " 293". 



And the distance of x from the centre of Saturn was found to be, 



Sept. 21st, at 12h. 30m., x following Saturn 220" 1 measure. 

 " 22d, at lOh. 30m., " " 192" 5 



" 23d, at 9h. 5m., " " 145" 5 " 



" 28th, at 9h. Om., x^^receding Saturn 156" 5 " 



" On each of these nights, with the exception of the 22d, the 

 observations were continued long enough to identify the satellite 

 by its motion. 



" The presence of the moon prevented our obtaining further 

 observations of the new satellite till the 13th of October, al- 

 though we lost much time in observing accidental stars, which 



