( 3Q7 ) 
4'2 2 Grains ; all the other Bodies together, hardly two 
‘ Grains lefs ; And this upon two or three Tryais fucceed- 
ed much the fame, notwithftanding they were made 
with all the Caution imaginable. Now lince lb fmall 
an Inequality is the Matter of fa£f, between Bodies of 
the fame Species weigh’d in Water, whole Difproporti- 
ons of Surfaces are, as i to 255, ffor I reckon the Sides 
of all .the Tincel Bodies to be equal to the Sides of the 
fingleBrafs piece,; I muft conclude, That thofe Bodies 
muff be infinitely fmall, whofe inequality of their Surfa- 
ces to their Bulks does exceed thofe in this Experiment : 
For fuppofing one of thefe thin Squares fhould be 
wrought into the form of a Globe, I am very apt to 
think, That the Difproportion then of its Surface to its 
Bulk of Matter, would not be fo great as its Prefent 
form renders it. 
Moreover, That altho the Difproportions of the Sur- 
faces of Bodies, to their bulk of Matter be very gi'eat ; 
yet, that that is the only Reafon why a Metalick Body 
. Ihould be fufpended in a Mefifiruum fpecifically lighter 
than it felf, is very doubtful : For certainly if it was fo, 
we might reafonably have expeded to have met with a • 
much greater Difference in the Bodies made ufe of in 
the newly reeked Experiment : .For there it fliould feem 
necelfary, that where we had fo great a Difference in 
point of Superficies, there we fliould alfo have had a 
Difference fomething proportional in point of weight ; 
which did nt>t happen. I think therefore that there 
muff be fome other Agent, or Quality, not only to aflilf, 
but Govern in the Cafe. And what we call a corroding 
Menfiruum^ I take to be*a Fluid adapt to attract fuch, or, 
fuch a Body, (as we find no one of them to operate 
alike on all 0 but, as I faid before, Jqua Rr^/b for fepa- 
rating the Parts of Gold, JquA Fonts for Silver: Now 
tliis Separation of their Parts by Attraction, feems to 
proceed from'the Menjlruums Aneflion to the Bodylm- 
X X 2 'mersd, 
