284 



SIR DAVID BREWSTER ON THE 



1844, April 22.— Fine day. Barom. 2980. 



Apparent Time. Arago. 



6 h 29 m R=27£° maximum polarisation, 22£° in S. horizon. 19° 31' 



7 15 20 34 



Babinet. 



6 37 21° 32' 



7 18 R= 28 \° maximum polarisation, 22|° in S. horizon. 17 28 



1844, April 24.— Barom. 2987. Fine day ; windy. 



Apparent Time. 

 6 h l m 

 6 38 



6 3 



Arago. 

 16° 55 

 20 30 



Babinet. 

 15° 58' 



1844, April 26.— Barom. 2984, rising. 



Apparent Time. 

 6 h 24 ra 



Arago. 

 19° 20' 



1844, April 27.— Barom. 3007, rising. 



R = 14° 

 7 2 A great whiteness in the sky. 



Apparent Time. 

 7J1 jm 



Arago. 

 20° 50' 

 Babinet. 

 23° 22' 



1844, May 2.— Barom. 30-25. 



Apparent Time. 

 5 h 52 m 

 6 



6 33 



7 22 



Arago. 



21° 5' 



R = 15i° maximum polarisation in zenith, 14|° in hor. 22 25 



R=17" „ „ 14 „ 23 20 



R = 20 „ „ 14A „ 22 25 



Babinet. 

 13° 40' 



1844, May 3.— See "Edinburgh Transactions," vol. xxiii p. 231. 

 1844, May 7.— Barom. 29-80. Whitish sky. 



Apparent Time. Arago. 



7 h 3 m R = 26£° maximum polarisation, 20|° in horizon. 20° 2' 



Babinet. 

 7 5 16° 30' 



1844, May 15.— Barom. 30 0, falling. Fine day. 



Apparent Time. 

 6 h 36 m 



6 52 



7 46 



6 50 



7 51 



Arago. 



16° 50' 



20 5 



21 40 

 Babinet. 

 16° 10' 

 21 15 



