At that moment Ali touched him slightly on the shoulder. He turned; Ali pointed to the window of the room in which they were, facing the street.

“I see!” said he, “there are two of them; one does the work while the other stands guard.” He made a sign to Ali not to lose sight of the man in the street, and turned to the one in the dressing-room.

The glass-cutter had entered, and was feeling his way, his arms stretched out before him. At last he appeared to have made himself familiar with his surroundings. There were two doors; he bolted them both.