14 



15 



17 



32 



19 



30 



18 



15 



Babinet. 



13 



40 



16 



3 



17 



11 



280 SIR DAVID BREWSTER ON THE 



1843, July 3.— Barom. 29-57, rising. 



Apparent Time. Arago. 



7 h 29 m R = 26° maximum polarisation in zenith, 20£° in S. hor. 16° 28' 



1843, July 6. 



Apparent Time. Arago. 



6 h 50 m R—.28J maximum polarisation in zenith, 22i° in hor. 11° 45' 

 7 1 



7 21 R= 181° polarisation of moon. 



8 13 R = 29° maximum polarisation in zenith plane. 

 8 55 



7 25 



8 15 R=28£ c polarisation of moon. 

 8 52 



1843, July 11.— Barom. 30-0, rising. 



Apparent Time. Arago. 



6 h 55 m R=29J° maximum polarisation in zenith ; clear sky. 12° 28' 

 7 51 White clouds forming in many places. 21 11 ! 



Babinet. 

 7 54 19° 10' 



1843, July 21.— Barom. 295 ; no rain. 



Apparent Time. Arao-o. 



7 h 34 m Thin clouds in zenith and near sun. 20° 4' 



1843, July 24.— Barom. 2987, rising; no rain. 



Apparent Time. Arago. 



6 h 58"> 17° 52' 



1843, August 6.— Barom. 2977, after a wet day. 



Apparent Time. Arago. 



7 h 27 m R = 29|° maximum polarisation in zenith ; sky clear. 18° 49' 



Babinet. 



7 49 17° 39' 



1843, August 9.— Fine day; rain yesterday. 



Apparent Time. Arago. 



7 h 37 m 19° 34' 



8 3 18 17 



1843, August 10.— Splendid day ; haze in zenith ; slight white cloud's. Barom. 

 29-97; hot. 



Apparent Time. 

 ll h 38 m R = 24° maximum polarisation in zenith plane. 



