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

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              ceſs of the heat, grew weaker then before.
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              <s>But though we reject not that gheſs, yet
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              it will not in the preſent caſe ſerve the
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              turn, becauſe that much ſmaller Glaſs
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              bubbles exactly cloſ'd, will, by the in­
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              cluded Air (though agitated but by the
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              heat of a very moderate Fire) be made
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              to fly in pieces. </s>
              <s>Whether we may be
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              aſſiſted to ſalve this Problem, by conſi­
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              dering that the heat does from within ve­
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              hemently agitate the Corpuſcles of the
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              Air, and adde its aſſiſtance to the Spring
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              they had before, I ſhall not now examine:
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              ſince I here but propoſe a Problem, and
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              that chiefly that by this memorable Story
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              of
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              Cabæus,
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              notice may be taken of the
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              prodigious power of Rarefaction, which
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              hereby appears capable of performing
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              ſtranger things then any of our Experi­
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              ments have hitherto aſcrib'd to it. </s>
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              <s>We ſhould hence, My Lord, imme­
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              diatly proceed to the next Experiment,
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              but that we think it fit, on this occaſion,
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              to acquaint You with what ſome former
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              tryals (though not made in our Engine)
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              have taught us, concerning what we
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              would have diſcover'd by the newly
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              mention'd Bubble that broke. </s>
              <s>And this
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              the rather, becauſe (a great part of this </s>
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