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prick’d Lines, the advanced part B, fuddenly, and with 
great fwiftnefs, ran back, and joining it felf with the 
Ends b b, formed it felf into the Figure C, quivering in 
the upper part, and darting down perpendicularly in fharp 
Points, as at D D D; and its Colour from a bright 
Light changed into the colours of a Rain-bow, but much 
fainter. It continued this way about a Minute, and then 
the fharp points D D D, gathering themfelvcs up into C, 
it changed again into a Iquare Sheet of Light, as at E, 
and fwell’d out at F, as before at B; and advancing 
leifurely, repeated the fame Scene as before, till itfeem’d 
at a great diftance to difperfe it felf into fmall thin light 
Clouds; tho’ ’cis probable that to rhofewho faw it in a 
like Situation, as it travell’d, it might make the fame 
appearance as ir did to me. I was very particular in ob- 
ferving it, and the next Morning drew it, and I think 
very exactly. I thould have continued longer to look 
at it, ( which I did for above a quarter of an Hour ) but 
that it was exceflive cold ; the beginning of it was very 
like the Aurora Borealis , which has been very frequent 
this Winter here. 
Y. Of the Infinity of the Sphere of Fix'd Stars. 
Edmund Halley, L. L. D. R. S. S. 
T H E Syflem of the World, as it is now under- 
flood, is taken to occupy the whole Abjfs of Space, 
and to be as fuch actually infinite ; and the appearance 
of the Sphere of Fixt Stars, flill difcoveringfmaller and 
fmaller ones, as you apply better Telefcopes, feems to 
confirm this Doctrine.. And indeed, were the whole Sy- 
stem 
