RECTIFICATIONS AND ADDITIONS. 457 



Pages 388390. 



By a kind communication from Sir John Herschel, dated 

 8th Nov. 1851, 1 learn that Mr. Lassell observed dis- 

 tinctly on the 24th, 28th, and 30th of October, and on 

 the 2d of November, 1851, two satellites of Uranus, 

 which appear to be still nearer to the planet than the first 

 satellite of Sir William Herschel, to which that astronomer 

 ascribed a period of revolution of about 5 days 21 hours, 

 but which has not been subsequently recognised. The 

 periods of revolution of the two satellites now seen by 

 Lassell were about 4 days and 2 J days. 



