The passage through the vague abysses would be frightful, for the Walpurgis-rhythm would be vibrating, and at last he would have to hear that hitherto-veiled cosmic pulsing which he so mortally dreaded. Even now he could detect a low, monstrous shaking whose tempo he suspected all too well. At Sabbat-time it always mounted and reached through to the worlds to summon the initiate to nameless rites. Half the chants of the Sabbat were patterned on this faintly overheard pulsing which no earthly ear could endure in its unveiled spatial fulness. Gilman wondered, too, whether he could trust his instincts to take him back to the right part of space. How could he be sure he would not land on that green-litten hillside of a far planet, on the tessellated terrace above the city of tentacled monsters somewhere beyond the galaxy or in the spiral black vortices of that ultimate void of Chaos where reigns the mindless demon-sultan Azathoth?