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

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                <pb xlink:href="013/01/338.jpg" pagenum="308"/>
              a Reaſon of the leſs difficult part of the
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              Problem: And though Your Lord­
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              ſhip ſhould ev'n preſs us to declare what
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              Conjecture it was, that the above-recited
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              Circumſtances ſuggeſted to us, we ſhould
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              propoſe the thoughts we then had, no o­
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              therwiſe then as bare Conjectures. </s>
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              <s>In caſe then our
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              Phænomenon
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              had con­
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              ſtantly and uniformly appear'd, we ſhould
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              have ſuſpected it to have been produc'd
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              after ſome ſuch manner as follows. </s>
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              <s>Firſt, we obſerv'd that, though that
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              which we ſaw in our Receiver ſeem'd to
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              be ſome kinde of Light, yet it was indeed
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              but a whiteneſs which did (as hath alrea­
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              dy been noted) opacate (as ſome ſpeak)
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              the inſide of the Glaſs. </s>
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              <s>Next we conſider'd, that our com­
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              mon Air abounds with Particles or little
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              Bodies, capable to reflect the Beams of
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              Light. </s>
              <s>Of this we might eaſily give di­
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              vers proofs, but we ſhall name but two:
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              The one, that vulgar obſervation of the
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              Motes that appear in Multitudes ſwim­
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              ming up and down in the Air, when the
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              Sun-beams ſhooting into a Room, or any
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              other ſhady Place diſcover them, though
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              otherwiſe the eye cannot diſtinguiſh them </s>
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