( ) 
net only the Receiver and Included Glafs were diftinguifii- 
able by it, but Hands and Fingers on the outfide were 
fo too. It is to be obferv'd, that altho the Quickfilver 
would give a Light upon a finall motion, yet would that 
Light be inhanc'd by the encreafe of that Motion. What 
farther cccurr'd was, That when a pretty bri^k Agitation 
of the Mercury was given, it would referable Waves of 
Light breaking on the fides of the Glafs, fcattering fome 
Species of the fame Appearance towards the upper part of 
ir. That upon the Repetition of the Experiment three or 
four times, the Phofphores feem*d every time to be more 
Vivid than other, till at laft, by often Qiaking the Quick* 
filver, its furface became fomething folid, rendring the 
Light lefs then, than it had before. That in this, as 
well as in all other Mercurial Experiments, the Light 
Exhibited is of a very pale Colour. That the firft Ap- 
pearance of this Light, is, when about half the Air coa- 
tain*d in the Recipient is exhaufted, which ftill encreafes 
with the Rarefaftion ^ And Confirms with all the reft, the 
Neceffity of a Rarefy'd Air to fuch a degree, to Produce 
the Mercurial Phofphore^ concurring with that made by the 
Motion of the Quickfilver in the Weather-glafs. 
Experiment V. 
Shewwg very odd Flafhes of Lights upon the Repetition of the 
Experiment J refembling a Shower of Fire. 
THe Account already given of this Experiment, fo far 
as occurred at the firft time of making, leaves me 
but little room to add more. However, altho but little, 
'tis too defer ving to pafs it by in filence : The Appearance of 
it being not only very furprizing, but Diftinguifhably the 
Clearelt and moft Vivid Light in all the Mercurial Phofpho- 
ri^ Produced in Rarefy'd Air. The Defcription of the Re- 
ceiver, Included Glafs, and Funnel, being before given, I 
fh^l direftly proceed to my farther Obfervations on the Ex- 
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