954.
How the river Po, in a short time might dry up the Adriatic sea in
the same way as it has dried up a large part of Lombardy.
The ebb and flow of the tide (955-960).
955.
Where there is a larger quantity of water, there is a greater flow
and ebb, but the contrary in narrow waters.
Look whether the sea is at its greatest flow when the moon is half
way over our hemisphere [on the meridian].
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