of the Atmosphere. 359 



1842, November 20, 21.— See Phil. Mag. vol.xxx.pp. 125,164. 



1842, November 27. — Barom. 29*15 in., rising. A dark band 

 along the horizon. 



Apparent time. 



h m 



3 57 R=27° in zenith, and 18£° in horizon. 



Arago's secondary neutral point in horizon, and primary 

 one considerably up. 



1842, December 3.— Barom. 29*95 in. Fine day. 



12 46 Arago's neutral point not risen. 



12 46 R=27l° max. pol. in zenith, 20£° in hor. Ar a s°-, 



2 16 R = 28i° max. pol. in zen., 18i° in hor. 19 20 



4 23 . . . . . . . . 24 22 



Babinet. 



4 28 . . . . . . . . 20 15 



1842, December 17. — Barom. 29*58 in., rising after rain* 



Arago. 



3 16 .. .. .. ... 18 5 



. . Babinet. 



3 19 R= 29° maximum polarization in zenith. 1/ 50 

 1842, December 18. — Barom. 29*79 in. Raining occasionally* 



Aragos 



11 13 .. .. ,. .. 13 45 



12 23 . . . . . . . . 14 42 



1842, December 22.— Barom. 29*38 in., falling. Rain. 

 2 43 .. ... .. .. 17 50 



Babinet. 



2 46 R = 29° max. polarization in zenith plane. 16 10 

 1842, December 23. — Barom. 2901 in., after rain. 



Arago. 



3 .. .. .. .. 18 16 



Babinet. 



3' 3 R= 30° max. pol. in zenith plane. 19 4 



1842, December 24.— Barom. 29*33 in. 



o _ _ Arago. 



12 3 R = 26| max. pol. in zenith plane. 15 28 



12 44 R=28 „ „ „ 15 5 



1 32 R=27 „ „ „ 17 30 



2 24 R=29 „ „ „ 18 40 



3 8 R=27i „ „ „ 17 52 

 3 37 R=29| „ „ „ 19 14 



Babinet. 

 q, 07 j The point of maximum polarization rising ) ,„ q 



I as the sun's altitude diminishes. ( 



3 5 ... .. ., .. 20 6 . 



3 39 .. .. .. .. 17 55! 



1842, December 26.— Barom. 28*88 in. 



Arago. 



1 3 R = 26^° max. polarization, alt. 30°. 16 25. 



3 27 .. .. .. .. 17 15 



Babinet. 



3 30 R=28° max. polarization in zenith plane. 17 40 



