By his gestures it seemed to Graham that he hesitated between two directions.

Abruptly he went towards the corner where the apparatus stood about the little crystal ball.

As he did so the undertone of tumultuous shouting from the archway that had continued during all these occurrences rose to a mighty sound, roared as if it were sweeping past, and fell again as if receding swiftly.

It drew Graham after it with an irresistible attraction.

He glanced at the thickset man, and then obeyed his impulse.