Straightway I became conscious of a presence in the room, and a chilling breath thrilled through my very being. “He is no such thing,” cried my wife, “and you are breaking the Commandments in thus dishonouring your own grandson.” But I took no notice of her. Looking round in every direction I could see nothing; yet still I felt a presence, and shivered as the cold whisper came again. I started up. “What is the matter?” said my wife, “there is no draught; what are you looking for? There is nothing.” There was nothing; and I resumed my seat, again exclaiming, “The boy is a fool, I say; 3 3 can have no meaning in geometry.” At once there came a distinctly audible reply, “The boy is not a fool; and 3 3 has an obvious Geometrical meaning.”