of the Atmosphere. 



123 



This singular height of the neutral point arose doubtless from 

 the haze in the horizon. 



Mean time. 

 h m 



3 45 p.m. 



4 12 „ 



4 17 „ 



R = maximum polarization . 



In zenith. In horizon. 



o o 



22i 191 



Height of neutral point 

 above the antisolar point. 



19 56 



20 3 



1841, November 25. — Barom. 29'63 in. Singularly fine day. 



Apparent time. 

 10 31 A.M. 



12 noon. 

 21 P.M. 



3 „ 

 20 „ 

 24 „ 

 38 „ 



27] 



m 



2b\ 

 25l 



27] 



14 30 

 14 6 



17 35 



18 45 



19 50 



18 40 



19 20 



1842, January 29. — Barom. 29*93 in. Fine day; clear sky; 

 snow covers the ground partially. 



3 34 a.m. 27 27\ 21 46 



3 52 „ . . . . 20 38 



4 10 „ .. .. 20 40 



1842, February 15. — Rain in morning; fine day afterwards; 

 barom. 3005 in. ; wind west. 



3 13 a.m. 



3 38 „ 



3 48 „ 



3 58 „ 



4 21 „ 

 4 47 „ 

 4 51 „ 



26] 



26; 



27* 



I 18iinS.H. I Neutral point 



)22|inW.Hj not risen. 



. . In App. H. 7 30 



181 8 17 



9 7 



14 35 



16 55 



22| in S.E. 17 52 



The observations at 3 h 38 m , 48 m , and 58 m are recorded as 

 good, and made in the finest sky. 



The state of the atmosphere was peculiar near the horizon, 

 as will be seen in the section^on a secondary neutral point (p. 128). 



1842, February 16.— Barom. 3016 in. 



A China-ink ) 



muddy sky. | 



19A 



12 



2 48 a.m. 



3 18 „ 

 3 22 „ 



3 44 „ 



4 12 „ 



4 3/ „ 



4 58 „ 



22^ 



22^ at 25 alt. 



i A secondary 

 | neutral point. 



Neut. point not risen, 

 do. do. 



10 30 



12 



17 30 



17 10 



18 20 



1842, February 18. — Cold, wind west and rather strong. 

 12 h m , I observed a curious effect on the polarized bands in the 



