(473) 
yet I juftly fuppofcd, that if^by the agitation of the liquor , 
iDore parts of it ftiould be quickly expofed to the afticnof the 
Air, the Colaratiou weuld be haften'd,which upon tryal appeared 
to be true.] 
Experiment the Seventh. 
[Experience having made me think it likely jthat ftroug Sprit of 
SdArmoniac^ made without Quick-lime, would operate more 
nimbly and more powerfully on that metal than our Spirit of lirin 
had done } we took fuch a Conical Glafs, as has been lately de- 
fcribed , and covering the bottom of it with a convenient quanti- 
. ty of Filings of good Copper, we poured on them as much ftrong 
^^intof Sd Armoniaczs ferved tofwim about a fingers breadth 
above them I and,having let down fuch a Mercurial Gage as is for- 
merly mention*d^ fothacit leaned uponthe bottom and fideof the 
GJafs, weclofedit very well with a ftopple and fet it in aquiet 
and well enlightened place, having taken good notice aX what mark 
the Quickfilver refted intheopen legof the Oage; Thrsdone^we 
let the alone to work upon the Filings, which it did;, 
asweforefaw, fomewhat flowly and very calmly, without pro- 
ducing any noifeor fenfible bubbles, acquiring by degrees a very 
pleaiant blew colour, and afTorded us alfo the Phsenomenon we 
chiefly lookt after $ which was, that repairing from time to time 
£0 the window to fee what part, we perceived, that for two or 
three daics together the Mercury in thefeard legof the Gagedid^ 
though very flowly, defcend till it appeared to be near a quarter 
of an inch lower than at firfl: ; and probably the deprefilon mighc 
have been greater, if fome indifcreet body or other had not, by 
tampering with the Glafs, difturbed the Experiment^ whofe e° 
vent yet feemed fafficiently to argue, that the Spring of the Air, 
contained in the cavity of the Glafs; and communicating with that 
in the open leg of the Gage or Syphon, was weaken'd incomparifon 
of that inthcclofed leg, which by the Hermetic Seal on one fide, 
and the Quickfilver on the other fide, was kept from fuch Commu° 
nication. 
And becaufe I thought, it might be fufpeded, that the Pheno- 
menon might be referrable to fome Inequality in the preflTure of 
the Air, occafioned by the greater operation of the heat of the 
day on the more imprifon'd Air of the Gage, than on that more 
immediately included in the cavity of the Vial j I was careful to 
