1and twenty ounces and an halfe, and as
much Air as was requiſite to fill it weigh
ing eleven graines, the proportion in gra
vity of Air to Water of the ſame bulk
will be as one to 938. And though we
could not fill the Æolipile with water, ſo
exactly as we would, yet in regard we
could not either as perfectly as we would,
drive the Air out of it by heat; we think
the proportion may well enough hold:
but thoſe that are delighted with round
numbers (as the phraſe is) will not be
much miſtaken if they reckon water to be
neere a thouſand times heavier than Air.
And (for further proof that we have made
the proportion betwixt theſe two bodies
rather greater then leſſer then indeed it is;
and alſo to confirme our former obſerva
tion of the weight of the Air) we will adde,
That, having another time put ſome Wa
ter into the Æolipile before we ſet it on
the fire, that the copious vapours of the
rarefied liquor might the better drive out
the Air, we found, upon try all carefully
made, that when the Æolipile was refrige
rated, and the included vapours were by
the cold turned againe into water (which
could not have happen'd to the Air, that
the preceeding Steams expell'd) the Air,
much Air as was requiſite to fill it weigh
ing eleven graines, the proportion in gra
vity of Air to Water of the ſame bulk
will be as one to 938. And though we
could not fill the Æolipile with water, ſo
exactly as we would, yet in regard we
could not either as perfectly as we would,
drive the Air out of it by heat; we think
the proportion may well enough hold:
but thoſe that are delighted with round
numbers (as the phraſe is) will not be
much miſtaken if they reckon water to be
neere a thouſand times heavier than Air.
And (for further proof that we have made
the proportion betwixt theſe two bodies
rather greater then leſſer then indeed it is;
and alſo to confirme our former obſerva
tion of the weight of the Air) we will adde,
That, having another time put ſome Wa
ter into the Æolipile before we ſet it on
the fire, that the copious vapours of the
rarefied liquor might the better drive out
the Air, we found, upon try all carefully
made, that when the Æolipile was refrige
rated, and the included vapours were by
the cold turned againe into water (which
could not have happen'd to the Air, that
the preceeding Steams expell'd) the Air,
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