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

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              full of fair water, you ſhall ſee the Water
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              and Wine by degrees mingle with one an­
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              other; the one falling downe as it were in
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              little colour'd ſtreames, and the other aſ­
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              cending into its room in the like curled
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              ſtreames, ſometimes preceded by round
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              parcels of water, which, by reaſon of their
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              tranſparency, looke almoſt like bubbles.
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              </s>
              <s>The other circumſtances of this Experi­
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              ment, belonging not all of them to our
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              preſent purpoſe, we ſhall content our
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              ſelves with taking notice of one which
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              ſeemes the moſt important, and may illu­
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              ſtrate and confirme ſome things former­
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              ly delivered. </s>
              <s>And it was, That if, when
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              the
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              ſuperficies
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              of our Smoke lay ſmooth
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              and horizontal, a hot iron were held near
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              the our ſide of the Receiver, the Neigh­
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              bouring part of the included fumes (for
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              the reſt did not very much alter their for­
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              mer
                <emph type="italics"/>
              ſuperficies
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              ) being rarified by the heat,
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              would readily aſcend in a large Pillar of
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              ſmoke to the very top of the Receiver,
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              yet without ſeeming to looſe a diſtinct
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                <emph type="italics"/>
              ſuperficies,
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              or to be confounded with Air;
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              below which, upon the receſs of the ad­
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              ventitious heat that by agitating it im­
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              pell'd it upward, it would againe ſub­
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              ſide. </s>
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