appears to subsist between it and the Formation of Clouds. 37 



"Oct. 25, l h 30 m a.m. (after a violent storm). The sky pre- 

 sented a singularly wild appearance, heavy masses of cloud 

 driving along from N.N.E., whilst at a greater elevation fleecy 

 cumuli and cirrocumuli strongly luminous overspread the whole 

 sky. Some spaces between the clouds showed a thin veil of 

 cirri which dimmed the stars in the same manner as the auroral 

 light does. It was nearly equal to this in the intensity of its 

 light, which was, however, whiter. 



" Nov. 20, 9 h p.m. A very distinct luminous haze similar to 

 the above over the whole sky. Wind high from S.W. 



" Dec. 20, 9 h p.m. Cirrostrati extending across the sky from 

 W. to E. The spaces between the bands very decidedly lumi- 

 nous over the whole sky, nearly equalling in this respect a faint 

 aurora. Wind light from W. ; barometer declining. 



" 1847. Jan. 30, 10 h p.m. Faint auroral light in N.W., which 

 soon assumed the appearance of cirrous streaks crossing the 

 magnetic meridian at right angles. At 10 h 31 m an arch was 

 formed, narrow but well-defined, especially the lower edge, which 

 was about 18° or 19° above the N.N.W. point. 



" Feb. 6. Fine auroral arch, accompanied by cirrostrati and 

 other appearances similar to those already described. 



"June 6. A fine display of parhelia occasioned by cirri, &c. 



" Oct. 24. A splendid crimson and yellow aurora, accompanied 

 by cirrostrati. Appearances similar to those before noticed. 



"Nov. 2, 9 h 15 m p.m. Calm, sky almost cloudless, cirrostratus 

 haze over the whole sky in the form of alternately light and 

 dark bands of various widths stretching continuously across the 

 sky from W.S.W. to E.N.E. These bands appeared fainter 

 overhead than to N. and S., but this might be owing to a smaller 

 body of vapour meeting the eye in that direction. The light 

 and dark bands in the southern part of the sky appeared to be 

 nearly equally dense, stars down to the third magnitude being 

 indistinctly visible through both, the obscuration produced not 

 exceeding that caused by a moderately bright aurora. In the 

 north the dark bands were denser, being well-defined cirrostratus 

 streaks, the spaces between which were luminous. 



" Nov. 9. A similar display of luminous cirrostrati. On this 

 occasion the bands ranged N.N.W. to S.S.E. They were long 

 and slender, and better marked at the N.N.W. point than at the 

 opposite. They did not seem to be formed by spinning or 

 shooting out from a point as they are sometimes seen to do, but 

 looked rather as if formed simultaneously along their whole 

 length, invisibly faint at first, but becoming gradually more 

 definite. 



" 1848. Sept. 18, 10 h 30 m p.m. Luminous cirri extending 



