Boyle, Robert - New experiments physico-mechanicall, touching the spring of the air and its effects

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1the Glaſs was weaken'd) the Impriſon'd
Air began to ſwell in the Bladder, and as
more and more of the Air in the Recei
ver was, from time to time, drawn out; ſo
did that in the Bladder more and more ex
pand it ſelf, and diſplay the folds of the
formerly flaccid Bladder: ſo that before we
had exhauſted the Receiver near ſo much
as we could, the Bladder appear'd as full
and ſtretched, as if it had been blown up
with a Quill.

And that it may appear that this plump
neſs of the Bladder proceeded from the
ſurmounting of the debilitated Spring of
the ambient Air remaining in the Veſſel,
by the ſtronger Spring of the Air remain
ing in the Bladder; we Return'd the Key
of the Stop-cock, and by degrees allow'd
the external Air to return into the Recei
ver: Whereupon it happen'd, as was ex
pected, that as the Air came in from with
out, the diſturb'd Air in the Bladder, was
proportionably compreſſ'd into a narrow
er room, and the ſides of the Bladder
grew flaccid, till the Receiver having re
admitted its wonted quantity of Air, the
Bladder appear'd as full of wrinkles and
cavities as before.

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