c «3» ; 
Continuity of the Light ; they Tby the Reflection of 
the Vapour floating in the Atmofphere, and being not 
reflected, where the Air betwixt them is free of thofe 
Vapours^ may appear as Pillars: And as the Flafli be- 
low and beyond them moves (^as it kindles and ex- 
pands) fothey feem to move, and perhaps are ihock’d 
at the fame time by the Motion ; but afterwards, when 
they are nearer,and raifed to the Altitude of Degrees, 
we get fomewhat under them, and fee the Expanfion 
of the Exploflon, which appearing fomewhat globular, 
gives the faint Colours obferved above, the Light not 
being intenfe enough to make them vivid ; and after- 
wards when they rife to, or near the Zenith, they are 
nighefl to us, and then expand very wide at each Flalh, 
like little Clouds : And I think, the great Objedion of 
their appearing in the Northern Part of the Hemi- 
fphere, and feldom or never in the Southern, is in fome 
meafure anfwer d by the Appearance on the 26/^ ,* 
fince at leaft half of the Arch was in the Southern 
Part of the Hemifphere ,* and perhaps the Reafon why 
the Light is not feen near the Horizon, in the Southern 
Part of the Hemifphere, may be this, that in clear fe- 
rene Weather, the Wind being generally near the 
North, Objeds from thence are much more diftindly 
view’d, and at a greater diftance than from the South; 
and 'tis generally known, that Lands at a great diflance 
are moft diftindly feen, when the Winds blow from 
them. 
And perhaps a cold Northerly freezing Air may 
be neediul to kindle the Vapours, when a contrary 
Motion above (higher in the Atmofphere) may car- 
ry the Sulphureous Vapour, which falling down 
from the Nitrous Vapour may be kindled. Which, 
I fuppofe, form the Undulations of the Smoak after tiie 
Ex- 
