of the Atmosphere, 355 



1842, April 24.— Barom. 29'84 in., rising. 



Apparent time, 

 h m 



3 A haze. Babinet's neutral point 70° high ; Brewster's 

 not yet risen. After the haze had increased the sky- 

 cleared. Babinet. 

 /* n-i ("Altitude of Arago's neutral point \ % a A 



\ above horizon . . . . J 



6 10 „ „ „ „ 13 



6 10 Secondary neutral point exactly in horizon. 



1842, April 25, 26, 27, 28, 29.— See Phil. Mag. vol. xxx. pp. 

 125, 168, 169. 



1842, May 2.— Barom. 29*93 in. ; wind east. 



Arago. 



6 18 . . . . 23 45 



7 1 R = 22^° zenith to 18^° in horizon. 24 45 

 7 45 . . . . . . 20 15 



Babinet. 



6 21 R=28i maximum in zenith plane. 16 30 



1842, May 3*. — China-ink sky; wind east. 



9 a.m. R=19^° maximum polarization in zenith to 14^° in 

 horizon. 



11 „ R=19|° maximum polarization in zenith to \A\° in 



horizon ; bands ragged. 



Arago. 



1129 „ R = 20° ; maximum at 89° from sun. 10 15 



12 15 „ R = 20° .. .. .. 9 25 



1842, May 4. 



5 56 



r- of The — bands of secondary neutral point \ ■. « .** 

 \ distinct, and this point commenced J 



6 13 . , . . . . . . 20 46 



c -icf The secondary neutral point distinctly \ 9 i i 



\ formed . . . . . . j " 



1842, May 9.— Barom. 2983 in. 



5 42 R=22£° in zenith plane. 



6 7 Bands all positive . . . . 19 15 

 6 18 Positive bands still in horizon. 



6 39 22 47 



7 28 . . . . . . . . 23 21 



Babinet. 



6 45 .. .. .. .. 15 



7 30 R = 19^° in zenith plane .. 16 5 



1842, May 15, 16, 17.— See Phil. Mag. vol. xxx. pp. 125, 

 164, 169. 



]842, July 16.— At Lacock Abbey, Wiltshire. 



R= 23° in a singularly fine day, this low polarization indi- 

 cating nebulosity, which collected and produced rain. 



* See Phil. Mag. vol. xxx. pp. 169, 173. 

 2 A2 



