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

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              certain conſiſtence of Air requiſite to Re­
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              ſpiration; ſo that if it be too thick, and
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              already over-charged with vapors, it will
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              be unfit to unite with, and carry off thoſe
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              of the Blood, as Water will diſſolve, and
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              aſſociate to it ſelf but a certain proportion
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              of ſaline Corpuſcles; and if it be too
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              thin or rarefied, the number or ſize of the
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              Aërial Particles is too ſmall to be able to
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              aſſume and carry off the halituous Excre­
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              ments of the Blood, in ſuch plenty as is
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              requiſite. </s>
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              <s>Now that Air too much thicken'd (and
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              as it were clogg'd) with Steams, is unfit
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              for Reſpiration, may appear by what is
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              wont to happen in the Lead-Mines of
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              De­
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              vonſhire,
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              (and, for ought I know, in thoſe
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              too of other Countrys, though I have
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              ſeen Mines where no ſuch thing was com­
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              plain'd of) for I have been inform'd by
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              more then one credible Perſon (and parti­
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              cularly by an Ingenious Man, that has of­
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              ten, for curioſity, digg'd in thoſe Mines,
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              and been imploy'd about them) that there
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              often riſes Damps, as retaining the
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              Ger­
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              mane
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              Word by which they call them)
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              which does ſo thicken the Air, that unleſs
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              the Work-men ſpeedily make ſigns to
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              them that are above, they would (which </s>
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