( t ! 5 5 ) 
from what is made by (baking Mercury in the Open Air? 
as was very fenfible at the making of this ExperimeHt. 
For, liaving put into a dean GMs Globe, (whole Content 
was equal to about 30 ounces of Water) about half a pound 
of pure Quickfilver, then clofing tlie mouth of it with a Brafs 
Cap, in whofe middle was inferred a Cock, by means of 
which a liberty was given for a free Comrauoication v;irh 
the Outward Air : Thus prepared, the Globe was (baken, 
and the Particles of Light appeared plentifully, about the 
bignefs of fmali Pins lieads, very vivid, refembling bright 
twinkling Stars, exhibiting fome fmall faint Light, like the 
whirifh Appearance 01 the Via LaSea, Their Number in- 
creased according to the Rapidity of the -Motion given. 
This being the whole produd of the Experiment in the 
Open Air, I then took the fame Glafs, with the fame 
Mercury, and apply'd it to the Pump, by means of a hol- 
low Brafs Pipe, which fcrew'd both to the Cock and 
Pump (in manner ot Fig, 4.) The Air from within which 
being withdrawn, and the Cock turn'd, to prevent i^s geft- 
ting in again, it was taken off', and moderately (haken 5 
the Mercury then did appear Luminous all round, not as 
before, like little bright Sparks, but as a Contina d Circle 
of Light during that motion : But when that Motion was 
checked with another of greater Violence^ it then appear'd 
Luminous almoft all over the Globe, Upon fufFering the 
Air to return, that mode of Light vanifh'd, nor could any 
thing be Recovered by (baking, but only the bright Sparks, 
as at firft. 
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