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In 1757, being at sea in a fleet of ninety-six sail bound
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against Louisbourg,
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I observed the wakes of two of the ships to be remarkably smooth,
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while all the others were ruffled by the wind, which blew fresh.
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Being puzzled with the differing appearance,
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I at last pointed it out to our captain
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and asked him the meaning of it.
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'The cooks,' said he, 'have I suppose
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just been emptying their greasy water through the scuppers,
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which has greased the sides of those ships a little.'"
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So there is an experimental evidence for what Pliny said.
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"Recollecting what I had formerly read in Pliny,