POLARISATION OF THE ATMOSPHERE. 279 



1843, June 13.— Barom. 30. Wind east 



Apparent Time. Arago. 



6 h 56 m 19° 15' 



9 10 20 25 



Babinet. 



7 R = 27jj° maximum polarisation in zenith plane. 25° 10' 



9 13 R=29| in zenith, horizon clear. 15 30 



1843, June 14. — Barom. 30-07. Splendid day ; wind east. 



Apparent Time. Babinet. 



Qh 12m R = 29±° maximum polarisation in zenith, 21|° in hor. 13° 30' 



7 59 R = 29J° „ „ 22J in hor. 15 30 



Arago. 



fR = 29J° maximum polarisation in zenith, 22|° in 1 1]0 

 \ horizon. Neutral point in horizon. J 



7 56 18 20 



1843, June 15.— See "Edinburgh Transactions," vol. xxiii. p. 231. 

 1843, June 16.— Barom. 30*0. Sky covered with white nebulosity. 



Apparent Time. 



12 h 20 m R = 25J° maximum polarisation in zenith plane. Arago. 



7 10° 45' 



7 38 17 50 



Babinet. 

 7 41 R = 29|-° maximum polarisation in zenith plane. 15° 55' 



1843, June 21.— See " Edinburgh Transactions," vol. xxiii. pp. 220, 227, 

 1843, June 22.— Barom. 29-90. Wind east ; fine day. 



Apparent Time. Arago. 



8 h 42 m Antisolar point in horizon. Clouds in zenith. 19° 15' 



1843, June 23.— Barom. 2992. Fine day. 



Apparent Time. Arago. 



7 h 17 m R=25° maximum polarisation in zenith, 18|° in hor. 15° 35 



7 26 17 30 



8 58 18 30 



Babinet. 



7 30 15 10 



9 R = 27|-° maximum polarisation in zenith, 22° in hor. 16° 50' 



1843, June 24.— Barom. 29 92. 



Apparent Time. Arago. 



7 h 8 m 17 C 47 



1843, June 26. 



Apparent Time. Arago. 



7 h 25m 21° 6' 



8 52 Neutral point in the middle of a bright orange cloud. 17 33 

 VOL. XXIV. PART II. 4 G 



