C *^9 ) 
-means feem’d to move aild change with one another, 
by the SucceHTion of Light and Darknefs, according to 
the Flaflies. When the lighted Vapour rofe higher to 
about or 45 Degrees, then the Appearance alter’d 
and indead of Beams, or Pillars of Light, as when 
low^er, there W’ere Flaihes like thofe attending Explofi- 
ons, wherein faint Colours of Red, Green and Yel- 
low appeared, but not very vivid ; and upon each Ex- 
plofion it would fpread upwards towards the Zenith, 
in the Appearance of chin enlighten’d Clouds, and im- 
mediately difappear. On the *about 9 at Night, 
one of thefe irregular Arches of Light had got up to 
the Zenith, the lower Points being near £• N. E and 
W. S. W. I then faw it for a confiderable time, at leail 
a quarter of an hour, and it had been there for fome 
time before I faw it. J could didin( 5 Hy obferve all the 
different Appearances, according to its Altitude in the 
Hemifphere, viz the louder part Cbeing w'ichin iz or 
14 Degrees, as near as I could compute) was a con- 
flant fixed Light, equal to the Light of the Edge of a 
white Cloud in the Day-time, when the Sun Ihincs on 
it. As it rofe higher, I could obferve it fomewhat weak- 
er, and could perceive the Motion of the Pillars or Beams 
of Light after each Flafh, which fecmed by that means 
to move. Somewhat higher again, at about 40 De- 
grees, the Flaihes were like Explofions of great Guns, 
with the faint Colours obferved as before ,* but the 
Corufcations or Flaflies from thence to the Zenith, ex- 
panded at every Flafh, like a broad, thin, w'hite Cloud, 
of which fome faint View could be feen after each 
Explofion for feme time : And after all the Explofions 
were over, there remaiifd a thin duskifh Vapour in 
and near the^ Zenith, and all along the Arch from Eafl 
to Weft, from 14 to 20 Degrees broad, which undula- 
ted and mov’d like a ftormy Sea, the Motion coming 
from 
