of the Atmosphere. 



353 



1842, April 2. 



Apparent time, 

 h m 



6 36 



6 38 



7 4 



Arago. 



19 15 

 19 42 



Babinet. 



18 5 



19 8 



20 18 



1842, April 3. — Fine clear sky ; hail in the afternoon. 



■. , .- ( Brewster's neutral point most distinctly I ^ n 

 | seen, Distance from sun . . \ 



1842, April 5, 6, 8.— See Phil. Mag. vol.xxx. pp. 124, 163, 

 164 & 168. 



1842, April 9.— Barom. 30-16 in. 

 3 25 R=22*° in zenith plane. 



5 46 



6 55 



7 



5 49 



6 57 



Effect of fog 



R=15^° in horizon 



Wind east ; bitterly cold. 

 The sky clear. Arago. 

 22 7 



15 20 



16 2 



Babinet. 



17 10 

 19 30 



Between 5 h 49 m and 6 h 57 m a fog came on, and there were no 

 neutral points. 



1842, April 10. 



4 5 R=18|° in zenith, and 14^° in horizon. 

 4 22 R=27° in zenith and 14|° in horizon. 



Babinet's neutral point very near the sun, and no neutral 

 point seen below the sun. 



1842, April 13.— Barom. 30'12 in. Fine day*. 



Arago. 



5 48 



. . . . . 





.. 



16 20 



6 20 



. . . . . 







17 55 



6 54 









19 40 



7 10 







, , 



19 45 



7 19 



R=30|° in zenith 





, . 



19 4 



7 29 



R=32i° in zenith 







22 10 



R increased from 25° at 4 h to 32^° 



at 5* 29 m . 





1842, April 15.— See Phil. Mag. vol 



. xxx. p. 168. Haze from 



west. 









5 40 



.. 



.. 



16 25 



5 48 



. . 





18 40 



5 57 



R= 14§° in zenith ; 18£° 20° 



above N. hor. 18 21 



6 28 



White nebulosity 



, , 



18 50 



7 







Babinet. 



5 50 



. . 







28 20 



* See Phil. Mag. vol. xxx. pp. 124, 164. 

 Phil. Mag. S. 4. Vol. 33. No. 224. May 1867. 



2A 



