explained. Exactly in the center of the room, there stood on a low tripod of brass the apparatus of which Averaud had so often spoken.
The contrivance was quite fantastic, and presented the appearance of some new, highly complicated musical instrument. I remember that there were many wires of varying thickness, stretched on a series of concave sounding-boards of some dark, unlustrous metal; and above these, there depended from three horizontal bars a number of square, circular and triangular gongs. Each of these appeared to be made of a different material; some were bright as gold, or translucent as jade; others were black and opaque as jet. A small hammer-like instrument hung opposite each gong, at the end of a silver wire.
Averaud proceeded to expound the scientific basis of his mechanism. The vibrational properties of the gongs, he said, were designed to neutralize with their sound-pitch all other cosmic vibrations than those of evil. He dwelt at much length on this extravagant theorem, developing it in a fashion oddly lucid. He ended his peroration:
"I need one more gong to complete the instrument; and this I hope to invent very soon. The triangular room, draped in black, and without windows, forms the ideal setting for my experiment. Apart from this room, I have not ventured to make any change in the house or its grounds, for fear of deranging some propitious element or collocation of elements."
More than ever, I thought that he was mad. And, though he had professed on many occasions to abhor the evil which he planned to evoke, I felt an inverted fanaticism in his attitude. In a less scientific age he would have been a devil-worshipper, a partaker in the abominations of the Black Mass; or would have given himself to the study and practice of sorcery. His was a religious soul that had failed to find good in the scheme of things; and lacking it, was impelled to make of evil itself an object of secret reverence.
"I fear that you think me insane," he observed in a sudden flash of clairvoyance. "Would you like to watch an experiment? Even though my invention is not completed, I may be able to convince you that my design is not altogether the fantasy of a disordered brain."
I consented. He turned on the
lights in the dim room. Then
he went to an angle of the wall and
pressed a hidden spring or switch.
The wires on which the tiny hammers
were strung began to oscillate,
till each of the hammers touched
lightly its companion gong. The
sound they made was dissonant and
disquieting to the last degree—a diabolic
percussion unlike anything I
have ever heard, and exquisitely
painful to the nerves. I felt as if
a flood of finely broken glass was
pouring into my ears.
The swinging of the hammers grew swifter and heavier; but, to my surprise, there was no corresponding increase of loudness in the sound. On the contrary, the clangor became slowly muted, till it was no more than an undertone which seemed to be coming from an immense depth or distance—an undertone still full of disquietude and torment, like the sobbing of far-off winds in hell, or the murmur of demonian fires on coasts of eternal ice. Said Averaud at my elbow:
"To a certain extent, the combined notes of the gongs are beyond hu-
