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9
87.
OF THE DELUGE AND OF MARINE SHELLS.
If you were to say that the shells which are to be seen within the
confines of Italy now, in our days, far from the sea and at such
heights, had been brought there by the deluge which left them there,
I should answer that if you believe that this deluge rose 7 cubits
above the highest mountains-- as he who measured it has
written--these shells, which always live near the sea-shore, should
have been left on the mountains; and not such a little way from the
foot of the mountains; nor all at one level, nor in layers upon
layers. And if you were to say that these shells are desirous of
remaining near to the margin of the sea, and that, as it rose in
height, the shells quitted their first home, and followed the
increase of the waters up to their highest level; to this I answer,
that the cockle is an animal of not more rapid movement than the
snail is out of water, or even somewhat slower; because it does not
swim, on the contrary it makes a furrow in the sand by means of its
sides, and in this furrow it will travel each day from 3 to 4
braccia; therefore this creature, with so slow a motion, could not
have travelled from the Adriatic sea as far as Monferrato in
Lombardy [Footnote: Monferrato di Lombardia. The range of hills of
Monferrato is in Piedmont, and Casale di Monferrato belonged, in
Leonardo's time, to the Marchese di Mantova.], which is 250 miles
distance, in 40 days; which he has said who took account of the
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