"Instantly there descended upon us, out of the empty air of that smoke-laden room, a force which I can only compare to the pushing, driving power of a great wind pent up within a narrow space. It was almost explosive in its effect, and it seemed to operate upon all parts of my body equally. It fell upon us with a rushing noise that filled my ears and made me think for a moment the very walls and roof of the building had been torn asunder. Under its first blow we staggered back against the wall, and I understood plainly that its purpose was to prevent us getting back into the circle in the middle of the floor.
"Pouring with perspiration, and breathless, with every muscle strained to the very utmost, we at length managed to get to the edge of the circle, and at this moment, so great was the opposing force, that I felt myself actually torn from Smith's arms, lifted from my feet, and twirled round in the direction of the windows as if the wheel of some great machine had caught my clothes and was tearing me to destruction in its revolution.
"But, even as I fell, bruised and breathless, against the wall, I saw Smith firmly upon his feet in the circle and slowly rising again to an upright position. My eyes never left his figure once in the next few minutes.
"He drew himself up to his full height. His great shoulders squared themselves. His head was thrown back a little, and as I looked I saw the expression on his face change swiftly from fear to one of absolute command. He looked steadily round the room and then his voice began to _vibrate_. At first in a low tone, it gradually rose till it assumed the same volume and intensity I had heard that night when he called up the stairs into my room.
"It was a curiously increasing sound, more like the swelling of an instrument than a human voice; and as it grew in power and filled the room, I became aware that a great change was being effected slowly and surely. The confusion of noise and rushings of air fell into the roll of long, steady vibrations not unlike those caused by the deeper pedals of an organ. The movements in the air became less violent, then grew decidedly weaker, and finally ceased altogether. The whisperings and sighings became fainter and fainter, till at last I could not hear them at all; and, strangest of all, the light emitted by the circle, as well as by the designs round it, increased to a steady glow, casting their radiance upwards with the weirdest possible effect upon his features. Slowly, by the power of his voice, behind which lay undoubtedly a genuine knowledge of the occult manipulation of sound, this man dominated the forces that had escaped from their proper sphere, until at length the room was reduced to silence and perfect order again.