THERMOMETRICAL OBSERVATIONS. 283 

 iSth. Thermometer 38" at fun rife, rofe to 58". 



Equai altitudes of the Sun. 

 A. M. 9" 45' 10". P. M. 3" 5' 8". 



At 6'' prepared to obferve the eclipfe of l/'s 4th fatellite. 

 — At about 6'' 20' the ihtellite began to lofe its luftre, 

 which gradually diminillicd till about 6'' 46', — from that 

 time it was not discernible with a magnifying power of 50, 

 but diftinfl: with 120. — at 7'' 23' 47" it was evidently more 

 bright, and at 7'' 35' hud almofl recovered its ufual bright- 

 nefs. 



The obferved times, and diflances of the ©'s and S 's neareft limbs. 



Means 20 49 59 73 8 10 



Repeated. 



Means 21 j8 42 



Error erf" the Sex- 

 tant add 8". 



i9tli. 



