33 8 Dr. Herschel’s Observations of the 
The southmost and nearest of the two satellites in conjunc- 
tion, is the next in size : I suppose it to be the ist. 
The 4th satellite is a little larger than the largest of the two 
satellites which are in conjunction ; but the difference is only 
visible with a great deal of attention. 
The 3d satellite is much larger than the 4th. 
August 9, 1794. i7 h 32". 10-feet reflector; power 170. 
The light of the 1st satellite is very intense and white. 
The light of the 2d satellite is also pretty intense and white. 
The light of the 3d satellite is neither so intense nor so white 
as that of the 1st. 
The light of the 4th is dull and of a ruddy tinge. 
With 300, and 400, the second is the least, and the 3d is the 
largest. I am in doubt whether the 4th or the 1st is largest; 
with 600, 1 suppose the 1st to be larger than the 4th. 
September 30, 1795. 20 h 15T7". 7-feet reflector; power 2 10. 
Order of the magnitudes of the satellites of Jupiter 3 - 2 . 1 , 4. 
Power 110. 3 - 2 , 1 . 4. With 460, 3 - 2 , 1 , 4.* 
October 2, 1795. 20 h 18' 22". 7-feet reflector; power 287. 
Jupiter’s satellites 3 - - 2 - 1 , 4. The 2d and 3d satellites are 
not yet in conjunction. 
20 h 43' 22". The conjunction between the 3d and 2d satel- 
lites is past. The distance between them is now one diameter 
of the 3d. 
August 18, 1796. i8 h 47' 21". 7-feet reflector; power 287. 
The 4th satellite is less bright than the 1st ; notwithstanding 
* Here, in order to denote the different magnitudes of the satellites, I used the 
notation which has been explained in my First Catalogue of the comparative Bright- 
ness of the Stars. See Phil. Trans, for the year 1796, Part I. page 189. 
