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.
981.
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