[ loor] 
a-days J or fas it was wont ro be called, and, I thinb 
better,) Intenfive gravity, one from the other ; (as, when 
we lay, an Ounce of Lead, is inteofively, though not Ex« 
teniively, hea%Mer then a Pound of Cork./ 
Now when feveral fluids, orfeveral parts ofa fluid^are 
thus of different weights i they will (from the general 
nature of heavy iiuids,) when undifturbed, change places 
with one another, till the heavier becomes lov/eft and 
the lighter higheft. 
And this, not onely as to the minuter parts ^ asisob- 
fervid in Chymical precipitations, or the finking at Sand 
in water, or its Imaller earthy particles which fabfidc 
in a muddy fediment, and the like of other Liquors when, 
at reft, and the atoms (as they were wont to be called,) 
flying in the ^ir when difturbed, but fubfidiag in the 
form of duft when at reft. All which according as they 
befmallerdo [Ceteris Paribus J fubfide more flow ly ("as 
dufl: flower then a clod of Earth, and Filings of G^/^iio- 
wer then a lump of it, and thin Plates of Lead layd hori- 
zontally, then either a round Bullet of the fame weight, 
or thofe Plates in a contrary pofition fet edgewife^y and 
ought by ftatick principles fas is eafiiy demonftrable J fo 
to do.But, much more, as to larger parcels. As when Oyl, 
V/ine,\yater,Beer, or other the like Liquors, are put toge- 
ther in the iame Veffehas will be obfervable to the Ey, e- 
fpecially v^diem their colours are coniiderably different. 
Thus, if a Bucket of Water, behafl:ily taken out ofa 
Pond, or a large VelGTel full of it, the vacant place will be 
prefently lupplyed with Jir (as the nimbler fluid, )& then 
with Water flowing (by a declivity,) from the higher 
parts,and (^becaufe heavyer,]thrufl:ing out the Jir ( which 
had prepoffeffd the place,j till it come to a due Equipois, 
And the fame ("from a like reafon,} muft happen, if 
fome parts of the fame Liquor, do accidentally acquire 
(by expanfion or otbervvife,) a greater degree of lightnefs 
then the other parts; thofe lightned parts afcending, 
the 
