Now look out at the pretty clear limestone stream running to meet us below, and the great limestone hills closing over us above. How do you think we shall get out from among them?
Shall we go over their tops?
No. That would be too steep a climb, for even such a great engine as this.
Then there is a crack which we can get through?
Look and see.
Why, we are coming to a regular wall of hill, and—
And going right through it in the dark. We are in the Box Tunnel.
* * * * *
There is the light again: and now I suppose you will find your tongue.
How long it seemed before we came out!