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

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              during his ſtay in
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              Malta,
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              he often ſaw
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              Mount
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              Ætna,
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              though the next day, not­
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              withſtanding its being extreamly clear, he
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              could not ſee it; adding, that
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              Vintemillius,
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              a very Learned Perſon, did oftentimes,
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              from a Hill he names, behold the whole
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              Iſland he calls
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              Luprica
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              protuberant above
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              the Sea, though at other times, notwith­
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              ſtanding a clear Sky, he could not ſee it.
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              </s>
              <s>And though perhaps this may be in part a­
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              ſcribed to the various light & poſition of
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              the ſun, or to the various diſpoſition of the
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              Spectators eye, or peradventure to ſome
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              other cauſe; yet the moſt probable cauſe
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              ſeems to be the differing Denſity of the
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              Air, occaſion'd by Exhalations capable to
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              increaſe the refraction, and conſequently
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              bring Beams to the Eye, which otherwiſe
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              would not fall on it. </s>
              <s>We have likewiſe
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              in another Treatiſe mention'd our having
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              often obſerv'd with Teleſcopes a plenty
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              of Steams in the Air, which without ſuch
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              a help would not be taken notice of, and
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              which as they were not at all times to be
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              ſeen even through a Teleſcope, ſo they
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              did ſometimes, eſpecially after a ſhower of
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              Rain, haſtily diſappear: and when we
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              have viſited thoſe places that abound with
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              Mines, we have ſeveral times been told </s>
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