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form a vacuum, as is said above; therefore it is inevitable, if it
is to be able to remain suspended in the air, that it should absorb
a certain quantity of air; and if it were mingled with the air, two
difficulties arise; that is to say: It must rarefy that portion of
the air with which it mingles; and for this cause the rarefied air
must fly up of itself and will not remain among the air that is
heavier than itself; and besides this the subtle spiritual essence
disunites itself, and its nature is modified, by which that nature
loses some of its first virtue. Added to these there is a third
difficulty, and this is that such a body formed of air assumed by
the spirits is exposed to the penetrating winds, which are
incessantly sundering and dispersing the united portions of the air,
revolving and whirling amidst the rest of the atmosphere; therefore
the spirit which is infused in this
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air would be dismembered or rent and broken up with the rending of
the air into which it was incorporated.
AS TO WHETHER THE SPIRIT, HAVING TAKEN THIS BODY OF AIR, CAN MOVE
OF
ITSELF OR NOT.
It is impossible that the spirit infused into a certain quantity of
air, should move this air; and this is proved by the above passage
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