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OF WAVES.
A wave of the sea always breaks in front of its base, and that
portion of the crest will then be lowest which before was highest.
[Footnote: The page of FRANCESCO DI GIORGIO'S Trattato, on which
Leonardo has written this remark, contains some notes on the
construction of dams, harbours &c.]
9
53.
That the shores of the sea constantly acquire more soil towards the
middle of the sea; that the rocks and promontories of the sea are
constantly being ruined and worn away; that the Mediterranean seas
will in time discover their bottom to the air, and all that will be
left will be the channel of the greatest river that enters it; and
this will run to the ocean and pour its waters into that with those
of all the rivers that are its tributaries.
9
54.
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).
782
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