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9
57.
Book 9 of the meeting of rivers and their flow and ebb. The cause is
the same in the sea, where it is caused by the straits of Gibraltar.
And again it is caused by whirlpools.
9
58.
OF THE FLOW AND EBB.
All seas have their flow and ebb in the same period, but they seem
to vary because the days do not begin at the same time throughout
the universe; in such wise as that when it is midday in our
hemisphere, it is midnight in the opposite hemisphere; and at the
Eastern boundary of the two hemispheres the night begins which
follows on the day, and at the Western boundary of these hemispheres
begins the day, which follows the night from the opposite side.
Hence it is to be inferred that the above mentioned swelling and
diminution in the height of the seas, although they take place in
one and the same space of time, are seen to vary from the above
mentioned causes. The waters are then withdrawn into the fissures
which start from the depths of the sea and which ramify inside the
body of the earth, corresponding to the sources of rivers, which are
constantly taking from the bottom of the sea the water which has
flowed into it. A sea of water is incessantly being drawn off from
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