sob* Dr. Herschel j s Observations 
Nov. 30, 178c). No satellite visible. If she has one, it must 
be less in appearance than a star of the 8th or 9th magni- 
tude ; power 300. 
Dec. 2, 1789. No spot ; power 157, 300, and 460. 
May 23, 1791. 40-feet reflector. The light of Venus is so 
brilliant that it becomes very uneasy for the eye to bear it 
long. There is no spot on the disk. 
I had prepared my apparatus for a regular succession of ob- 
servations with this instrument, having turned it towards the 
west, and put on the round-motion to keep the planet in 
view ; but found that the great advantage of this telescope, 
which is its superior light, was, on this occasion, not only un- 
necessary, but rather an inconvenience. 
Nov. 24, 1791. Correction of the clock, — 4 6", 7. 
I took measures of the diameter of Venus with the 20-feet 
reflector ; power 157. 
i2 h 18' 1st measure 45",486 
2d -46 ,142 
3 d 45 .514 
4th 45 ,814 
5 th 4 6 >°33 
6th 46 ,252 
Mean of the six measures 45",874 
I took five more, with a power of 300, the morning be- 
ing very fine and clear. 
