Listen to the river, louder and louder every step we take.
What a roar! Is there a waterfall there?
No.

It is only the flood.

And underneath the roar of that flood, do you not hear a deeper note--a dull rumbling, as if from underground?
Yes.

What is it?
The rolling of great stones under water, which are being polished against each other, as they hurry toward the sea.

Now, up on the parapet of the bridge.