of the Atmosphere. 299 



1841, June 15.— Barom. 30 in. at 9 h , and 29*8 in. at 10 h a.m. 



Mean time. Arago. 



h m , 



8 36 . . . . . . . . 18 45 



8 52 R=25|° at 40° alt. N.E. . . 18 32 



9 3 .. .. .. .. 18 9 



9 15 18 7 



9 40 .. .. .. .. 21 16 



9 52 R=28|° at 40° alt. N.E. . . 21 52 



1841, June 21.— Barom. 29'4in. 



Babinet. 



7 42 R= 24° at 40° alt., S. 21|° in zenith. 21 30 



7 52 ) (20 44 



8 0V Clouds passing over the neutral point. < 20 



9 15 ) (20 28 



1841, June 2.— Barom. 29*68 in. 



Arago. 



3 p.m. R=14|°. A faint whiteness over 

 „ blue sky. 



8 31 „ .. .. .. .. 17 37 



a A7 „ j R= 14|° in horizon, and 25^° in ) 1Q KQ 



5 *' „ \ zenith, and 24|° in alt. 40° S.W. ( iy ™ 



9 0,,.. . . .. ^ . . 18 45 



9 15 „ Sky not pure this evening . . 18 5 



9 30 „ . . . . ... . . 18 



1841, June 23.— Barom. 2972 in. Sky impure. 



8 5) (21 30 



8 23/ Clouds below the neutral point. Ob- J 17 25 

 8 45 f servations not satisfactory. ] 20 35 



8 52 J (20 48 



1841, June 27. — After three days of eastern haur and rain. 



10 a.m. R= 19^° in zenith plane, the sky being cloudy. 

 1 p.m. R= 14^° at 20° alt. in E. Barom. 29*6 in. and rising, 



7 30 „ . . . . . . . . 21 21 



„ j R=22^° in zenith plane, and 2U° at I QO r 



' 4i> » j 30° alt. . . . . . . I 



8 0,,.. .. .. .. 21 42 



8 18 „ .. .. .. .. 20 12 



When light clouds covered the sky round and over the neu- 

 tral point the polarization was + or vertical from the zenith to 

 the horizon. 



1841, June 28. — After a bad rainy day and the wind east, the 

 sky cleared up in the evening and the wind became west. 



8 50 p.m. .. .. .. .. 18 26 



9 13 „ .. .. .. .. 18 43 



1841, July 17.— See Phil. Mag. vol. xxx. p. 121. 



1841, July 24. 



6 40 R=14i°; cloudy sky .." 25 55 



