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 10" 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™ 49%, 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 
