, which is caused by the
yielding a little of the hardened Skin to a Contraction, after the very
outmost Surface is settled; and as for the internal parts, one may with
ones naked Eye perceive abundance of very conspicuous bubbles, and with the
_Microscope_ many more.

The Consideration of which Particulars will easily make the Third Position
probable, that is, that the parts of the drop will be of a very hard,
though of a rarified Texture; for if the outward parts of the Drop, by
reason of its hard crust, will indure very little Contraction, and the agil
Particles, included in those bubbles, by the losing of their agitation, by
the decrease of the Heat, lose also most part of their Spring and Expansive
power; it follows (the withdrawing of the heat being very sudden) that the
parts must be left in a very loose Texture, and by reason of the
implication of the parts one about another, which from their sluggishnes
and glutinousness I suppose to be much after the manner of the sticks in a
Thorn-bush, or a Lock of Wool; it will follow, I say, that the parts will
hold each other very strongly together, and indeavour to draw each other
neerer together, and consequently their Texture must be very hard and
stiff, but very much rarified.

And this will make probable my next Position, That _the parts of the Glass
are under a kind of tension or flexure, out of which they indeavour to
extricate and free themselves_, and thereby all the parts draw towards the
Center or middle, and would, if the outward parts would give way, as they
do when the outward parts cool leisurely (as in baking of Glasses) contract
the bulk of the drop into a much less compass. For since, as I proved
before, the Internal parts of the drop, when fluid, were of a very rarified
Texture, and, as it were, tos'd open like a Lock of Wool, and if they were
suffered leisurely to cool, would be again prest, as it were, close
together: And since that the heat, which kept them bended and open, is
removed, and yet the parts not suffered to get as neer together as they
naturally would; It follows, that the Particles remain under a kind of
_tension_ and _flexure_, and consequently have an indeavour to free
themselves from that _bending_ and _distension_, which they do, as soon as
either the tip be broken, or as soon as by a leisurely heating and cooling,
the parts are nealed into another posture.

And this will make my next Position probable, that _the parts of the Glass