of the Atmosphere* 301 



1841, September 15. — Barom. 29*61 in. Splendid day. 



Mean time. Arago. 



h m , 



10 a.m. R=27h° in zenith plane, and 25^° in horizon. 



10 18 „ R=2Si°. Maximum 8S D from horizon. 

 6* 0p.m. .. ... .. .. 19 54 



6 8,,.. .. .. .. 18 18 



6 10 „ Skv not altogether pure. . . 18 47 



6 28 „ R= 27 i° in zenith plane .. 18. 5 



1841, September 21. — Barom. 29-95 in. Sky not pure; an 

 eastern haur for three preceding days. 



4 50 R=15|° in zenith, and 14° 30' above S. horizon. 



4 55 Sky whiter in zenith than in horizon 21 59 



1841, September 23. — Barom. 29*47 in. Air damp, but no 

 rain. 



G p.m. R = 26|° in zenith, and 17£° 15° alt. S. 13 30 



The sky impure. Neutral point covered with small black 

 clouds; an eastern haur supervened. 



1841, September 26. — Barom. 29*25 in. Day showery. 



5 49 p.m. R = 26i° zenith ; 26^° in horizon. 22 2 

 6' ] „ Not free of clouds about neutral point. 20 2 



6 15 „ The sky purer . . . . 21 50 



1841, September 29. — See Philosophical Magazine, vol. 

 xxx. pp. 122, 162. 



1841, September 30.— Barom. 29'03 in. 



4 27 R=26° in zenith plane, and 25° 10° 



above S. horizon. 

 4 37 ) Sky whitish. j 20 20 



4 43 I Black cloud passed over neutral point. < 19 49 

 4 49 | ( 22 29 



1841, October 3. — Barom. 29*8 in. Wind north-east; cold. 



4 1 R=27i° in zenith plane, and 26i° 



above horizon. 

 4 44 .. 21 15 



A cloud passed, and the neutral point descended. 



1841, October 12. — Barom. 29*1 in. Beautiful morning ; the 

 sun rose free of clouds. 



6 17 a.m. J R=28i° in zenith, and26i° in f 21 25 

 24 .„ \ horizon . . . . \ 18 2( 



6 24 .„ \ horizon . . . . \ 18 20 



4 54 p.m. f R= 25° in zenith ; 27*° near J" 18 1 



5 10 „ \ horizon , w . . 1 19 57 



