( 4 10 ) 
ded was fcarce to be believed, feeming not inferiour to 
that of Lightning; and exhibiting, as it pad on, afore 
of momentaneous Nubecula, which difcovered it felf by 
a very diluted and faint Whitenefs ; and was no fooner 
formed, but before the Eye could well take it, it was 
gone, and left no Signs behind it. Nor was this a fingle 
appearance ; but for feveral Minutes that we regarded 
it, about fix or feven times in a Minute, the fame was 
again and again repeated •, thefe Waves of Vapour (if I 
may be allowed to ufe the Word ) regularly fucceeding 
one another, and, as we gueft, at intervals very nearly 
equal ; all of them in their Afcent producing a like tran- 
fient Nubecula. 
By this particular we were firft allured, that the Va- 
pour we faw, whatever it were, became confpicuous by 
its own proper Light, without help of the Suns Beams:: 
for thefe Nubecula did not difeover themfelves in any other 
part of their paflage, but only between the South-Eafl , 
and South, where being oppofite to the Sun they were 
deeped immer ft in the Cone of the Earths Shadow ; nor 
were they vifible before or after. Whereas the contrary 
mud have happened, had they borrowed their Light 
from the Sum 
We then made all the haft we could to a place where 
there is a free Profjpetft of the Northern Horizon.. Being 
come there, not much paft Ten of the Clock, we found, 
on the Weftern Side, viz. between the W. and N. W. the 
Reprefentation of a very bright Trvilivht , contiguous to 
the Horizon ; out of which there arofe very long Beams of 
Light, not exa&ly eretft toward the Vertex, but fomething 
declining to the South, which afeending by a quick and 
undulating Motion to a confiderable Height, vanilhed in 
a little time, whilft others, tho' at uncertain Intervals, 
fupply’d their Place. But at the fame time, through all 
the reft of the Northern Horizon, viz. from the North - 
Weft 
