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various spots. But how are we to account for the corals which are
found every day towards Monte Ferrato in Lombardy, with the holes of
the worms in them, sticking to rocks left uncovered by the currents
of rivers? These rocks are all covered with stocks and families of
oysters, which as we know, never move, but always remain with one of
their halves stuck to a rock, and the other they open to feed
themselves on the animalcules that swim in the water, which, hoping
to find good feeding ground, become the food of these shells. We do
not find that the sand mixed with seaweed has been petrified,
because the weed which was mingled with it has shrunk away, and this
the Po shows us every day in the debris of its banks.
Other problems (992-994).
9
92.
Why do we find the bones of great fishes and oysters and corals and
various other shells and sea-snails on the high summits of mountains
by the sea, just as we find them in low seas?
9
93.
You now have to prove that the shells cannot have originated if not
in salt water, almost all being of that sort; and that the shells in
Lombardy are at four levels, and thus it is everywhere, having been
made at various times. And they all occur in valleys that open
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