Mr. Key's Account, &c. 33 
appeared bright. It continued about half an hour after it was 
firft obferved by the company. 
In October 1775, I law a funilar arch at Leeds, of the 
fame colour, breadth, and pofition. It began to difappear in 
five or fix minutes after I had difcovered it, without changing 
its fituation. The manner in which it vanilhed was quite irre- 
gular ; large patches in different parts, and of different dimen- 
fions, ceafing to be luminous, till the whole had disappeared. 
The evening was rather cloudy. I made no obfervation on the 
Hate of the wind during the appearance of either of theie 
arches. 
Having read Mr. Cavallo’s Paper in the Philofophical 
Tran faff ions *, containing a defcription of a fimilar phaeno- 
menon, with fome remarks upon its nature, I determined to 
pay a greater attention to this meteor, if I Ihould ever happen 
to fee it again. During the laft fpring it appeared fo often, 
and with fuch a variety of circumftances, that I had an 
opportunity both of gratifying my curiofity, and fixing my 
judgement concerning it. 
As I was travelling in the evening of the 21ft of laft March, 
betwixt eight and nine o’clock, I obferved fomething like a 
bright cloud in the eaftern part of the hemifphere ; and fuf- 
pefting that it might be of the kind above defended, I looked 
through the glafs in the back part of the chaife in which I was 
riding, and faw a fimilar appearance in the oppofite part of the 
heavens. 1 immediately ordered the driver to flop, that 1 
might make as accurate an obfervation as my fituation would 
admit. I faw that the luminous bodies, which appeared in 
the eaftern and weftern parts of the horizon, were gonnedled 
by an arch of a fainter light ; and recollefling that the beft 
* Voh LXXI. p. 329. 
F 
Vol. LXXX. 
method 
