For that unwitting summons was answered. Scarcely had my companion's voice died away in that little room before the terror came. The room turned cold. A sudden wind shrieked in through the open window; a wind that was not of earth. It bore an evil bleating from afar, and at the sound my friend's face became a pale white mask of newly awakened fear. Then there was a crunching at the walls, and the window-ledge buckled before my staring eyes. From out of the nothingness beyond that opening came a sudden burst of lubricious laughter—a hysterical cackling born of utter madness. It rose to the grinning quintessence of all horror, without mouth to give it birth.