( 471 ) 
0/ the Sfringof the Air included in the Fejfels^ vpherein thefolutkn 
wa4 madey 1 thought Jit to try^ whether in fome metalline Diffolutions^ 
rvberein I had observed that fevp or novijible bubbles at all were pro - 
duced^ the Spring of the neighbouring and included Jir would not be 
debilitated 5 and in order t0 this were made the following Trjals, 
Experiment the tiftk 
E took fomeFilings of Copper,ancl putting them together 
with a Mercurial gage in a Conical 
Glafs fitted with an exadly ground flopple of ^^j^^^^^ 
the fame matter, f which was Crjftallinej we reewf/^intheConrinuati- 
poured on the Filings as much reflified Spirit ^V^ New PhjfiGo^ 
or fermented Unnm^dG per [e^ as futnced to mems, 
fwim an inch or better above them 5 then care- 
fully (topping the Glafs, coming to look on it many hours after,we 
perceived that the Mercury in the feal'd leg was confiderably de* 
preft, and gently drawing out the ftopple to let in the outward 
Air, we perceived that accefs to have a manifeft efFeft upon the 
Mercury.] 
But this will be better underflood by the more Gircumftantial 
Experiment that infues. 
Experiment the Sixth, 
[We took a Cryftal Glafs of an almofl: Conical firape, and capa- 
bleof containingbetween five and fix ounces of warer, and iur- 
niflied with a ftopple of the fame matter, that by grinding was 
exaftly fitted to it. Jnto this we put a convenient quantity of 
clean Filings of good Copper, on which we poured as much 
ftrong Spirit of (fermented, or rather) putrifi'd Urin, as ferved to 
fwimabour an icich above the Copper, and having let down a 
Mercurial. gage, fo that it leaned upon the . , 
bottom and fide of the Glafs, we dofed it very ^^^^^obg Ex""£e!^! 
well with a ftopple, and fet it in a quiet and 
well enlighten'd place, having taken good notice at what mark 
the Quickfil ver refted in the open leg of the Gage. This done, we 
let the Menflruum alone to work upon the Filings 3 which it did, 
as we forefaw, fomewhat flowly and very calmly mthout produ- 
cing any noife or fenfible bubbles^ acquiring by degrees a very 
pleafant blew colour, and the Glafs being kept quiQt in the faiiae 
place for two or three daies longer , the liquor.5 . as L con^eftur'd 
WOlild 
