1that by the dilatation of the Cheſt the
contiguous Air is thruſt away, and that
preſſing upon the next Air to it, and ſo
onwards, the Propulſion is continued till
the Air be driven into the Lungs, and ſo
dilate them: When this (I ſay) is an
ſwered, it is Objected even by Bartholine
himſelf, as a convincing Reply, that, ac
cording to this Doctrine, a Man could not
fetch his Breath from a great Veſſel full of
Air, with a ſlender Neck, becauſe, that
when his Mouth covers the Orifice of the
Neck, the dilatation of his Thorax could
not propell the Air in the Veſſel into his
Lungs, by reaſon of its being ſeparated
by the incloſing Veſſel from the ambient
Air; and yet, ſay they, Experience wit
neſſes that out of ſuch a Veſſel a Man may
ſuck Air. But of this difficulty our Engine
furniſhes us with an eaſie Solution, ſince
many of the former Experiments have ma
nifeſted, That in the caſe propoſed, there
needs not be made any (though 'tis true
that in ordinary Reſpiration there is wont
to be made ſome) propulſion of the Air by
the ſwelling Thorax or Abdomen into the
Lungs; ſince upon the bare Dilatation of
the Thorax, the Spring of that internal
Air, or halituous ſubſtance that is wont
contiguous Air is thruſt away, and that
preſſing upon the next Air to it, and ſo
onwards, the Propulſion is continued till
the Air be driven into the Lungs, and ſo
dilate them: When this (I ſay) is an
ſwered, it is Objected even by Bartholine
himſelf, as a convincing Reply, that, ac
cording to this Doctrine, a Man could not
fetch his Breath from a great Veſſel full of
Air, with a ſlender Neck, becauſe, that
when his Mouth covers the Orifice of the
Neck, the dilatation of his Thorax could
not propell the Air in the Veſſel into his
Lungs, by reaſon of its being ſeparated
by the incloſing Veſſel from the ambient
Air; and yet, ſay they, Experience wit
neſſes that out of ſuch a Veſſel a Man may
ſuck Air. But of this difficulty our Engine
furniſhes us with an eaſie Solution, ſince
many of the former Experiments have ma
nifeſted, That in the caſe propoſed, there
needs not be made any (though 'tis true
that in ordinary Reſpiration there is wont
to be made ſome) propulſion of the Air by
the ſwelling Thorax or Abdomen into the
Lungs; ſince upon the bare Dilatation of
the Thorax, the Spring of that internal
Air, or halituous ſubſtance that is wont