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stratified rocks, because from the summits of the banks, down to the
river the correspondence of the strata in the rocks is visible on
either side of the river. That the stratified stones of the
mountains are all layers of clay, deposited one above the other by
the various floods of the rivers. That the different size of the
strata is caused by the difference in the floods--that is to say
greater or lesser floods.
9
81.
The summits of mountains for a long time rise constantly.
The opposite sides of the mountains always approach each other
below; the depths of the valleys which are above the sphere of the
waters are in the course of time constantly getting nearer to the
centre of the world.
In an equal period, the valleys sink much more than the mountains
rise.
The bases of the mountains always come closer together.
In proportion as the valleys become deeper, the more quickly are
their sides worn away.
9
82.
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