of the Atmosphere. 347 



1842, January 25. — Snow covers the ground. Barom. 29*4 in. 



Apparent time. 

 h m 



1 iot,« j Arago's neutral point in horizon. 



i j^p.m. ") R=17 io in zenith plane> and ^ 



+ 15° in horizon. 



2 15 „ .. .. .. .. 16 45 



2 12 „ R=18|° in zenith, and 15° in horizon. 19 21 



3 40 „ R= 18£° in zenith, and at 50° alt. 15°. 16 20 



Babinet. 



2 15 „ . 17 20 



3 36 „ . . . . . . . . 18 30 



1842, January 27.— Barom. 292 in. ; therm. 36° at 8 h 30 m . 



Arago. 



q . I R=24|° near horizon; neutral line 



o <y± A.M. \ . 



\ concave to sun. 



2 20 p.m. .. .. .. .. 11 50 



4 3/,,.. . . . . . . 20 40 



2 32 „ R=25° in zenith plane and S. horizon. 



Babinet. 



a oc (Thin clouds, almost invisible every- I ,o 4fJ 

 " ( where but above the sun \ 



1842, January 28.— Barom. 22*69 in. Fine day ; fresh. 



Arago. 



2 7 p.m. R=22£° zenith; 25^° in E. horizon. 13 5 

 o ' O o j R= 26i° in zenith ; 27£° in S.E., i 01 , - 

 and 26±° in S.W. horizon. f ZV Vb 



3 43 



4 5 



3 21 



3 47 



4 2 



20 25 

 19 41 



Babinet. 



18 48 

 18 10 

 16 52 



xxx. pp. 123, 163. 



1842, January 29.— See Phil. Mag. vol. 



1842, February 2. — Very fine day, and clear sky till 2 h . 



11 30 a.m. Arago's neutral point not risen. 



R=25° in zenith plane, 20|° in horizon. 



* Arago. 



2 p.m. A thick, impure sky. .. 16 50 



1842, February 3. — Fine day. 



4 43 p.m. . . . . . . . . 20 20 



Babinet. 



4 45 „ .. .. .. .. 22 1 



1842, February 4. — Barom. 30*15 in. Fine day; cloudy. 



Arago. 



3 14 R=20±° in zenith, 24|° at 50° alt.W. hor. 18 40 



(R=25° in zenith, thin whitish clouds,) 



4 \ 24^° in E. horizon, 10° alt., 22±° in [ 20 37 



( alt., 20° W. horizon . . | 



4 44 . . . . . . . . 20 14 



