254 SIR DAVID BREWSTER ON THE 



1841, June 10. — See " Edinburgh Transactions," vol. xxiii. pp. 214 and 223. 

 1841, June 11.— Barom. 29-8. Wind north-east. 



R=26£° in zenith, and 24^° in horizon. 

 R = 27° in zenith and horizon. 



Mean Time 



4 h 



45m 



6 



38 



7 



34 



7 



42 



8 



5 



8 



18 



8 



36 



8 



52 



9 



3 



9 



15 



9 



25 



9 



33 



9 



45 



9 



55 



10 







Arago. 



19° 



37' 



19 



3 



19 







18 



52 



18 



50 



18 



32 



19 



12 



19 



17 



19 



20 



21 



37 



23 



39 



25 



22 



25 



13 



Mean of observations within less than 4° of the horizon, 18° 40'. The evening 

 was not so fine as yesterday. 



1841, June 12.— Barom. 29-85. Wind north-east. 



Mean Time. 



9 h m a.m. R=24l° in horizon, 26£° in zenith, and 



R=25£ ahout 20° alt. S.W. and S.E. 

 11 22 R=24| in zenith. 



1 p.m. R = 23| in zenith. Sky fine. 



The day became cloudy, but suddenly cleared up at 8 h p.m., when R = 28%° 

 in zenith and horizon. 



Therm. 50° R= 28£° in horizon. 



21 54 

 24 43 



Mean of observations within less than 4° of the horizon, 17° 39'. 



Mean Time. Babinet. 



8 h 25 m 17° 13' 



8 54 17 12 



9 8 17 20 



Mear 



Time 



8 h 



18 m 



8 



36 



8 



52 



9 



3 



9 



15 



9 



25 



9 



33 



9 



45 



10 







2\i a 



17° 



22' 



17 



15 



18 



8 



17 



30 



18 



42 



18 



50 



20 



52 



1841, June 14.— Barom. 296. 



Mean Time. 





7 h 45 m 





7 51 



R=26i° in N.E 



8 5 





8 18 





8 36 





Arago. 

 18° 35' 

 19 15 

 18 53 

 18 58 



