Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660

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For on the one ſide it appears, that not­
withſtanding the exſuction of the Air, our
Receiver may not be deſtitute of all Bo­
dies, ſince any thing placed in it, may be
ſeen there; which would not be, if it
were not pervious to thoſe Beams of
Light which rebounding from the ſeen
Object to our eyes, affect us with the ſenſe
of it: And that either theſe Beams are
Corporeal Emanations from ſome lucid
body, or elſe at leaſt the light they convey
doth reſult from the brisk Motion of ſome
ſubtle Matter, I could, if I miſtake not,
ſufficiently manifeſt out of the Dialogues
above-mention'd, if I thought your Lord­
ſhip could ſeriouſly imagine that Light
could be convey'd without, at leaſt, having
(if I may ſo ſpeak) a Body for its Ve­
hicle.
By the ſixteenth Experiment, it alſo
appears that the cloſeneſs of our Receiver
hinders it not from admitting the Efflu­
via of the Load-ſtone; which makes it
very probable that it alſo freely admits
the Magnetical ſteams of the Earth; con­
cerning which, we have in another Trea­
tiſe endeavour'd to manifeſt that numbers
of them do always permeate our Air.
But on the other ſide it may be ſaid,

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