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lake of Como, the Mincio from the lake of Garda, the Rhine from the
lakes of Constance and of Chur, and from the lake of Lucerne, like
the Tigris which passes through Asia Minor carrying with it the
waters of three lakes, one above the other at different heights of
which the highest is Munace, the middle one Pallas, and the lowest
Triton; the Nile again flows from three very high lakes in Ethiopia.
[Footnote 5: Pietra Pana, a mountain near Florence. If for Norcia,
we may read Norchia, the remains of the Etruscan city near Viterbo,
there can be no doubt that by 'Lago della Sibilla'--a name not
known elsewhere, so far as I can learn--Leonardo meant Lago di
Vico (Lacus Ciminus, Aen. 7).]
9
34.
OF THE CENTRE OF THE OCEAN.
The centre of the sphere of waters is the true centre of the globe
of our world, which is composed of water and earth, having the shape
of a sphere. But, if you want to find the centre of the element of
the earth, this is placed at a point equidistant from the surface of
the ocean, and not equidistant from the surface of the earth; for it
is evident that this globe of earth has nowhere any perfect
rotundity, excepting in places where the sea is, or marshes or other
still waters. And every part of the earth that rises above the water
is farther from the centre.
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