“He has been in the habit of lighting his pipe at lamps and gas-jets. You can see that it is quite charred all down one side. Of course a match could not have done that. Why should a man hold a match to the side of his pipe? But you cannot light it at a lamp without getting the bowl charred. And it is all on the right side of the pipe. From that I gather that he is a left-handed man. You hold your own pipe to the lamp, and see how naturally you, being right-handed, hold the left side to the flame. You might do it once the other way, but not as a constancy. This has always been held so. Then he has bitten through his amber. It takes a muscular, energetic fellow, and one with a good set of teeth, to do that. But if I am not mistaken I hear him upon the stair, so we shall have something more interesting than his pipe to study.”

An instant later our door opened, and a tall young man entered the room. He was well but quietly dressed in a dark-gray suit, and carried a brown wide-awake in his hand. I should have put him at about thirty, though he was really some years older.