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

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              or cold. </s>
              <s>And ſince alſo that according to
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              the bare denſity or rarity of the Air in­
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              cumbent on the ſubjacent Quick-ſilver in
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              the Veſſel, that in the Tube was impell'd
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              more or leſs high; ſuch changes happen­
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              ing in the neighboring part of the out­
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              ward Air, either by the aſcenſion of groſs
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              or copious exhalations, or by any other
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              cauſe (of which there may be divers) as
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              were capable to make conſiderable altera­
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              tions in the conſiſtence of the Air, as to
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              rarity and denſity,
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              may
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              be able propor­
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              tionably to alter the heighth of the
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              Quick-ſilver: I rather ſay, that ſuch alte­
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              rations
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              may
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              be, then that they
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              are
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              the
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              cauſes of our
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              Phænomenon,
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              becauſe I think
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              it ſufficient, if I have propoſ'd conje­
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              ctures not altogether irrational about a
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              new Myſtery of Nature, touching which,
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              the chief thing I pretend to, is to give oc­
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              caſion to the Curious to inquire further
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              into it then I have been yet able to do. </s>
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              <s>THe ſame Reaſon that mov'd us to
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              conclude, that by the drawing of the
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              Air out of the Receiver, the Mercury
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              would deſcend in a Tube ſhorter then ſix
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              and twenty digits, induc'd us alſo to ex-</s>
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