At some time I must have fallen quietly asleep, for I recall a distinct sense of leaving strange dreams, when the cat started violently from his placid position. I saw him in the faint auroral glow, head strained forward, fore feet on my ankles, and hind feet stretched behind. He was looking intensely at a point on the wall somewhat west of the window, a point which to my eye had nothing to mark it, but toward which all my attention was now directed.

I seemed to be looking down from an immense height upon a twilit grotto, knee-deep with filth, where a white-bearded daemon swineherd drove about with his staff a flock of fungous, flabby beasts whose appearance filled me with unutterable loathing. Then, as the swineherd paused and nodded over his task, a mighty swarm of rats rained down on the stinking abyss and fell to devouring beasts and man alike.

...for on every side of the chamber the walls were alive with nauseous sound—the verminous slithering of ravenous, gigantic rats.

The rats continued their riot, stampeding with such force and distinctness that I could finally assign to their motions a definite direction. These creatures, in numbers apparently inexhaustible, were engaged in one stupendous migration from inconceivable heights to some depth conceivably, or inconceivably, below.