Their eyes were greeted with an impressive spectacle.

A vast level plain stretched before them, watered by a sinuous stream; and beyond there towered up against the sky a long and lofty barrier of some kind, they did not know what.

The Tumble-Bug said he believed it was simply land tilted up on its edge, because he knew he could see trees on it.

But Professor Snail and the others said: "You are hired to dig, sir--that is all.

We need your muscle, not your brains.