QUOTE : The tower, I should have said, was square; and in every corner the step was made of a great stone of a different shape to join the flights. Well, I had come close to one of these turns, when, feeling forward as usual, my hand slipped upon an edge and found nothing but emptiness beyond it. The stair had been carried no higher; to set a stranger mounting it in the darkness was to send him straight to his death; and (although, thanks to the lightning and my own precautions, I was safe enough) the mere thought of the peril in which I might have stood, and the dreadful height I might have fallen from, brought out the sweat upon my body and relaxed my joints.