1cend into it, namely, Whether they mount
upwards by vertue of any ſuch poſitive le
vity (as ſome Peripateticks ſpeak) ac
quir'd together with their Aërial nature,
as inables them to pierce through part of
the Atmoſphere, and over-come its re
ſiſtance. Or elſe, whether theſe ſteams
being once raiſ'd above the Earth by their
agitation, have their aſcent and ſuſtenta
tion aloft, rather promoted then hindred
by the Air: as the inferior parts of that,
being thicker and heavier then the ſupe
rior, the ſteams can more eaſily continue
for a while their agitation upwards then
downwards; And afterwards are by the
ſame fluidity and thickneſs of the Air,
carried to and fro in it, and kept from re
lapſing to the Earth, as in the Sea water
the ſaline parts are kept from ſubſiding by
thoſe aqueous ones wherewith they are
aſſociated.
upwards by vertue of any ſuch poſitive le
vity (as ſome Peripateticks ſpeak) ac
quir'd together with their Aërial nature,
as inables them to pierce through part of
the Atmoſphere, and over-come its re
ſiſtance. Or elſe, whether theſe ſteams
being once raiſ'd above the Earth by their
agitation, have their aſcent and ſuſtenta
tion aloft, rather promoted then hindred
by the Air: as the inferior parts of that,
being thicker and heavier then the ſupe
rior, the ſteams can more eaſily continue
for a while their agitation upwards then
downwards; And afterwards are by the
ſame fluidity and thickneſs of the Air,
carried to and fro in it, and kept from re
lapſing to the Earth, as in the Sea water
the ſaline parts are kept from ſubſiding by
thoſe aqueous ones wherewith they are
aſſociated.
Experi
ment 29
ment 29
We hop'd to illuſtrate this matter, by
obſerving the motion of the ſmoke, pro
ceeding from kindled or flaming Bodies in
our exhauſted Receiver. But as we for
merly noted, upon the exſuction of the
Air, the ſmoking of thoſe Bodies pre
ſently ceaſ'd. We had thoughts alſo of
conveying into our Pneumatical Glaſs a
obſerving the motion of the ſmoke, pro
ceeding from kindled or flaming Bodies in
our exhauſted Receiver. But as we for
merly noted, upon the exſuction of the
Air, the ſmoking of thoſe Bodies pre
ſently ceaſ'd. We had thoughts alſo of
conveying into our Pneumatical Glaſs a