1dily dilated it ſelf downward, from the
Receiver into the Pump, when 'tis plain,
that it is not the incumbent Atmoſphere,
but onely the ſubjacent Air in the braſs
Cylinder that has been remov'd: If this,
I ſay, be objected, we may reply, That
when a man ſqueezes a Fleece of Wool in
his hand, he may feel that the Wool in
ceſſantly bears againſt his hand, as that
which hinders the hairs it conſiſts of, to
recover their former and more natural ex
tent. So each parcel of the Air about the
Earth, does conſtantly endeavour to thruſt
away all thoſe contiguous Bodies, whe
ther Aërial or more groſs, that keep
them bent, and hinder the expanſion of
its parts, which will dilate themſelves or
flie abroad towards that part, whether up
wards or downwards, where they finde
their attempted Dilatation of themſelves
leſs reſiſted by the neihgboring Bodies.
Thus the Corpuſcles of that Air we have
been all this while ſpeaking of, being un
able, by reaſon of their weight, to aſcend
above the Convexity of the Atmoſphere,
and by reaſon of the reſiſtance of the ſur
face of the Earth and Water, to fall down
lower, they are forced, by their own gra
vity and this reſiſtance, to expand and
Receiver into the Pump, when 'tis plain,
that it is not the incumbent Atmoſphere,
but onely the ſubjacent Air in the braſs
Cylinder that has been remov'd: If this,
I ſay, be objected, we may reply, That
when a man ſqueezes a Fleece of Wool in
his hand, he may feel that the Wool in
ceſſantly bears againſt his hand, as that
which hinders the hairs it conſiſts of, to
recover their former and more natural ex
tent. So each parcel of the Air about the
Earth, does conſtantly endeavour to thruſt
away all thoſe contiguous Bodies, whe
ther Aërial or more groſs, that keep
them bent, and hinder the expanſion of
its parts, which will dilate themſelves or
flie abroad towards that part, whether up
wards or downwards, where they finde
their attempted Dilatation of themſelves
leſs reſiſted by the neihgboring Bodies.
Thus the Corpuſcles of that Air we have
been all this while ſpeaking of, being un
able, by reaſon of their weight, to aſcend
above the Convexity of the Atmoſphere,
and by reaſon of the reſiſtance of the ſur
face of the Earth and Water, to fall down
lower, they are forced, by their own gra
vity and this reſiſtance, to expand and