What is Mr. Lorry dreaming about as he travels?

Mr. Lorry dozes off and begins to dream in the coach, imagining the comforting environment of Tellson's Bank. He is then confronted by what he calls a spectre: a man who has been buried for eighteen years and has dug his way out. A conversation that Mr. Lorry's brain repeats three times with this spectre confirms that he has been buried for eighteen years. As the sun rises, Mr. Lorry wakes up from his dream and surveys the vivid countryside, pitying a man who would be locked away from nature for eighteen years.