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9
32.
THE BEGINNING OF THE BOOK ON WATER.
Sea is the name given to that water which is wide and deep, in which
the waters have not much motion.
[Footnote: Only the beginning of this passage is here given, the
remainder consists of definitions which have no direct bearing on
the subject.]
Of the surface of the water in relation to the globe (933-936).
9
33.
The centres of the sphere of water are two, one universal and common
to all water, the other particular. The universal one is that which
is common to all waters not in motion, which exist in great
quantities. As canals, ditches, ponds, fountains, wells, dead
rivers, lakes, stagnant pools and seas, which, although they are at
various levels, have each in itself the limits of their superficies
equally distant from the centre of the earth, such as lakes placed
at the tops of high mountains; as the lake near Pietra Pana and the
lake of the Sybil near Norcia; and all the lakes that give rise to
great rivers, as the Ticino from Lago Maggiore, the Adda from the
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