452 



to represent some of the remarkable appearances, the period 

 of whose occurrence I have noted down ; and these will pro- 

 bably enable other observers to recognize the changes suffi- 

 ciently to allow of a comparison of the observed period of 

 their occurrence. 



** The time given is, as accurately as I could ascertain it, 

 Liverpool mean time, which, of course, may easily be re- 

 duced to Greenwich or Dublin time, by persons anxious to 

 compare their observations. 



" Before 10 o'clock, p.m., I remarked a bank of light in 

 the northern horizon, which gradually assumed the form of a 

 very well defined arch, the luminous part being of less 

 breadth than is usually the case. The arch continued slowly 

 to rise, without exhibiting any appearance of streamers, un- 

 til some minutes past ten, p.m., when the altitude of its up- 

 per surface may have been about 10°; it then began to exhi- 

 bit an appearance resembling the glow above a furnace, and 

 at lO'' 10™ 8^ a very brilliant streamer ascended from a lit- 

 tle to the east of the centre of the arch. 



" The phenomena of streamers were now, for some mi- 

 nutes, exhibited with great brilliancy. At 10^ 12"^ 49S a 

 broad column of bright light was seen about the centre of 

 the arch, as in the subjoined sketch. 



" Up to this time the arch had preserved its regular form ; 

 but a separation now gradually took place, the bow seeming 

 as if broken in the middle, and the eastern side remaining 



