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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>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. </
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>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 </
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