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

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="013/01/168.jpg" pagenum="138"/>
              by the Diggers, that even when the Sky
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              ſeem'd clear, there would not ſeldom ſud­
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              denly ariſe, and ſometimes long continue,
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              a certain Steam (which they uſually call a
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              damp) ſo groſs and thick, that it would
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              oftentimes put out their very Candles, if
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              they did not ſeaſonably prevent it. </s>
              <s>And
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              I think it will eaſily be granted, that the
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              aſcenſion of ſuch Steams into this or that
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              part of the Air, and their mixing with it,
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              are very like to thicken it; as on the o­
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              ther ſide either heat or the ſudden conden­
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              ſation of the Air in another part of the At­
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              moſphere (to mention now no other cau­
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              ſes) are capable of rarifying it. </s>
            </p>
            <p type="main">
              <s>Nor will it very much import the main
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              ſcope of our Diſcourſe, whether it be
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              ſuppoſ'd that the copious Steams the
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              earth ſends into the air, thicken that part
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              of the Atmoſphere that receives them,
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              and make it more heavy: Or that ſome­
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              times the Fumes may aſcend with ſuch ce­
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              lerity, that though the Air be thicken'd
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              yet they rather diminiſh then encreaſe its
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              gravitation, in regard that the quickneſs
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              of their aſcent, not onely keeps them
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              from gravitating themſelves, but may
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              hinder the preſſing downwards of many
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              Aërial Corpuſcles that they meet with in </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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