ON THE SATELLITES OF URANUS. 103 



On the 18th of January, 1790, he recorded an object 

 "excessively faint, and only seen by glimpses two 

 diameters of the planet following." 



On the 27th of March, 1794, he recorded as follows : 

 " I had many glimpses of small stars or supposed satel- 

 lites, but not one of them could I see for any constancy. 

 They were only lucid glimpses." 



On the 15th of February, 1798, an interior satellite 

 was seen about its greatest northern elongation, between 

 the planet and the second satellite. On the 16th the 

 place where the satellite had been the day before was 

 scrupulously examined, and as there was no star remain- 

 ing in that place, the removal of the interior satellite 

 from its former position was ascertained. 



On the 17th of April, 1801, the interior satellite was 

 seen about its greatest southern elongation. On the fol- 

 lowing night, no star was visible in the same position. 



It must be considered doubtful whether in 1790 and 

 1794, Sir William Herschel really saw an interior satel- 

 lite. The observations of 1798 and 1801 appear to be 

 more reliable; but the interval between these ob- 

 servations does not correspond very well with the motion 

 of either the first or second satellite of Lassell. It is 

 possible that one of these observations may have been 

 made upon the first satellite, and the other upon the 

 second. 



In one instance Sir William Herschel saw what he 

 called an intermediate satellite. 



On the 26th of March, 1794, a supposed satellite was 



