of the A tmosphere. 1 69 



1842, April 28. — Barom. 30 in. Fine sky ; wind east. 



Distance of neutral point 

 Apparent time. from sun. 



h m oi 



11 24 .. .. 10 55 



1842, April 29. 



11 4 .. .. 11 20 



1842, May 3. — China-ink sky ; wind east. 



11 29 .. .. 10 15 



12 15 .. .. 9 25 



1842, May 16.— Barom. 30*3 in. Thick haze; sun faintly 

 seen. 



8 49 a.m. Neutral point below the horizon. The sun now 

 quite hid, and no bands seen below him. A great glare 

 of light, and a sort of quaquaversus polarization. 

 N.B. When the neutral point is out of the plane passing 

 through the sun, the zenith, and the observer, it arises 

 in certain cases from there being a greater haze on one 

 side of the plane than on the other. 



1842, May 17.— Barom. 30*22 in. Haze all the day. 



11 The neutral point beneath the horizon. 



12 30 Several neutral points, three at least below the sun, as the 



haze flies past in different thicknesses. 



1842, August 17. — Barom. 28'8 in. Fine day ; sky clear at 2 h . 



2 9 Neutral point seen both below and above the sun. 



1842, August 28. — Adiffused haze came over a bright blue sky. 



3 49 The neutral point below the sun was almost in thehorizon, 



and Babinet's neutral point near the zenith. 

 5 30 Sun invisible ; mist thick ; and the polarization everywhere 

 positive, and very feeble. 



1843, February 13.— Barom. 297 in. Fine sky. 



1 10 .. .. 15 



1843, February 16. — Barom. 29*15 in. Fine sky. 

 12 57 .. .. 11 25 



1843, April 30.— Barom. 30*07 in. Not a cloud. Neutral 

 points distinctly seen, both above and below the sun. 



4 15 Neutral point under the sun still above the horizon. 



1843, June 15. — Barom. 30*03 in. Splendid day; wind east. 

 12 13 .. .. 8 10 



7 . . . . 9 49 



1844, May 3.— Barom. 30*15 in. 



11 3 The neutral point below the sun distinctly seen. In order 

 to see it well, I look at it perpendicularly through a plate 

 of glass. The bands on each side of it are increased in 

 intensity, the bands above being reversed. 



