THERMOMETRICAL OBSERVATIONS. 225 



few minutes broke into very minute clouds which mov- 

 ed with great rapidity towards the eaft, and in lefs than 

 fifteen minutes extended over tlie whole hemifpherc. — 

 The ftars appeared and difappeared almofc inftantly ; I 

 fuppofe that « Andromeda: not lefs than thirty times dur- 

 ing the obfervation ; ;3 Andromedte was likewife fecn, 

 but it appeared and diiappeared too rapidly to be obferved 

 with any degree of certainty, /s Tauri was feen almoft 

 as frequently as ^ Andromedae, but the obfervation never- 

 thelefs appeared to be correft. Before Caftor and Pollux 

 came to the meridian, the clouds became heavy and dark, 

 and obfcured all the ftars for the remainder of the night. 

 This phenomenon was not attended with any wind. 



"o" 



Thermometer 31° at fun rife, rofe to 45°. 



J J t]-j, Equal altitude J of iht Sun. 



Emerfton of the ift fatcllite of If. obferved at 15'' 26' 34". 

 — The planet was low and tremulous, the belts middling 

 diftinft, magnifying power of the telefcope 120. 



Thermometer during the three laft obfer- 

 vations at 21°. 

 12th. Cloudy all day. 

 1 3th. Cloudy till evening. 



Obferved 



