on the Planet Venus. 
•05 
doubted from these observations ; and that she has an atmo- 
sphere is as evident, from the changes I took notice of, which 
surely cannot be upon the solid body of the planet. 
Sept. 18, 1780. No spot on Venus; diameter 38", 4. 
Oct. 10, 1780. With a very perfect 7-feet speculum ; power 
227, 460, and 932. No spot visible ; diameter 41", 3. 
Oct. 11, 1780. No spot ; diameter 2 7 // ,8. 
Oct. 20, 21, 23, 1780. No spot visible. 
April 17, 1783. 10-feet reflector; power 324. I see some 
darkish spots on Venus. 7-feet reflector ; power 227. The 
same appearances; but in neither of the instruments are they 
determined enough to serve for the purpose of finding the 
rotation. 
May 21, 1783. 10-feet reflector ; a new speculum ; power 
250. 
7 h 30'. No spot visible. 
8 h 30'. There seems to be an ill defined spot. 
9 h 15'. No motion can be perceived that may be depended 
upon, though the figure seems rather advancing towards the 
centre. 
May 30, 31, and June 1, 6 , 1783. Spots were observed 
with 10 and 20-feet reflectors, and also motion perceived in 
them. Continued observations were recorded ; and a great 
many figures delineated. 
Dee. 3, 1783. With 460, and 932. No spot. No kind of pro- 
tuberance, or indenture in the line which terminates the illu- 
mination, that might denote a mountain. 
Feb. 13, 1785. No spot. A new 10-feet Newtonian reflector. 
April 8, 1788. No spot on Venus; but she is still at too 
great a distance for such observations. 
2 E . 
MDCCXCIII. 
