Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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they were wont to play up and down
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in it, and ſo by their whiteiſhneſs, to e
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mulate in ſome meaſure the apparition of
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Light. </
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>For we likewiſe ſometimes found, by
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watchful obſervation, that when the
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Flaſh was great, not onely at the very
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inſtant the Receiver loſt of its tranſpa
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rency, by appearing full of ſome kinde
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of whitiſh ſubſtance; but that for ſome
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ſhort time after the ſides of the Glaſs
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continued ſomewhat opacous, and
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ſeem'd to be darken'd, as if ſome
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whitiſh Steam adher'd to the inſide of
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them. </
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>He that would render a Reaſon of
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the
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Phænomenon,
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whereof all theſe are
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not all the Circumſtances, muſt doe
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two things; whereof the one is diffi
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cult, and the other little leſs then im
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poſſible: For he muſt give an Ac
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count not onely whence the appearing
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whiteneſs proceeds, but wherefore that
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whiteneſs does ſometimes appear and
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ſometimes not. </
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>For our part, we freely confeſſe
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our ſelves at a loſſe about rendering </
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