1 Pump to be ſomewhat obſtinately ply'd,
to diſcover the better what may be ex-
pected from the thinneſs of the medium
in this Experiment; the Impriſon'd Air
broke its brittle Priſon, and throwing the
greateſt part of it againſt the ſide of the
Receiver, daſh'd it againſt that thick Glaſs
into a multitude of pieces.Which Acci-
dent I mention, partly that it may con-
firm what we deliver'd in our Reflections,
upon the firſt Experiment, where we con-
ſider'd what would probably be done by
the Spring of Air Impriſon'd in ſuch
Glaſſes, in caſe the ballancing preſſure of
the ambient Air were withdrawn; and
partly, that we may thence diſcern of how
cloſe a Texture Glaſs is, ſince ſo very
thin a film of Glaſs (if I may ſo call it)
prov'd ſo impervious to the Air, that it
could not get away through the Pores,
but was forc'd to break the glaſs in pieces
to free it ſelf; and this, notwithſtanding
the time and advantage it had to try to
get out at the Pores.And this I mention,
that neitherour Experiments, nor thoſe
of divers Learned Men, might receive
any prejudice from an Experiment which
I happen'd to make divers years ago, and,
which having been ſo much taken notice
to diſcover the better what may be ex-
pected from the thinneſs of the medium
in this Experiment; the Impriſon'd Air
broke its brittle Priſon, and throwing the
greateſt part of it againſt the ſide of the
Receiver, daſh'd it againſt that thick Glaſs
into a multitude of pieces.Which Acci-
dent I mention, partly that it may con-
firm what we deliver'd in our Reflections,
upon the firſt Experiment, where we con-
ſider'd what would probably be done by
the Spring of Air Impriſon'd in ſuch
Glaſſes, in caſe the ballancing preſſure of
the ambient Air were withdrawn; and
partly, that we may thence diſcern of how
cloſe a Texture Glaſs is, ſince ſo very
thin a film of Glaſs (if I may ſo call it)
prov'd ſo impervious to the Air, that it
could not get away through the Pores,
but was forc'd to break the glaſs in pieces
to free it ſelf; and this, notwithſtanding
the time and advantage it had to try to
get out at the Pores.And this I mention,
that neitherour Experiments, nor thoſe
of divers Learned Men, might receive
any prejudice from an Experiment which
I happen'd to make divers years ago, and,
which having been ſo much taken notice
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