"Vibration, mon cher monsieur," said he, "is everything. According to the researches of the Ecole Polytechnique, in Paris—no doubt you, yourself, have studied there, n'est-ce pas?—vibration of the first octave from 2 to 8 per second, give us no sense-impression. From the fourth to the fifteenth octave, 16 to 32,768 per second, we get sound. The qualities of the 16th to the 24th are—or have been, until I investigated—quite unknown. The 25th to the 35th, 33, 554, 432 to 34, 859, 738, 868 vibrations per second, give us electricity. Thence to the 45th, again unknown.
"The 4th to the 48th give us heat. The 49th gives light The 50th, chemical rays, vibrating 1, 125, 899, 906, 842, 624 per second. The 51st to the 57th have never been touched by anyone save myself. The X-ray group extends from the 58th to the 61st octave. The 62d, with 4, 611, 686, 427, 889, 904 vibrations per second, is a field where only I have worked. And beyond these, no doubt, other octaves extend with infinite possibilities.
"You will note, monsieur," he continued, while the dun penumbra still more and more withdrew him from Leclair's sight, "that great lacunae exist in the scale of vibratory phenomena. Some of the so-called lower animals take cognizance of vibrations that mean nothing to us. Insects hear notes far above our dull ears. Ants are susceptible to lights and colors unseen to our limited eyes. The emperor-moth calls its mate—so says Fabre—by means of olfactory vibrations totally uncomprehended by us. The universe is full of hues, tones, radiant phenomena that escape us, because our senses are not attuned to them."
Steadily he spoke, and steadily the humming drone that filled the cabin kept its undertones that lulled, that soothed. The Frenchman, staring, hardly breathed. Rigid he sat and pale, with sweat now slowly guttering down his face, his jaws clamped hard and white.
"If the true nature of the universe could suddenly be revealed to our senses," went on the Master, now hardly more than a dull blur, "we could not survive. The crash of cosmic sound, the blaze of strange lights, the hurricane forces of tempestuous energies sweeping space would blind, deafen, shrivel, annihilate us like so many flies swept into a furnace. Nature has been kind; she has surrounded us with natural ray-filters of protection."
His voice now seemed issuing from a kind of vacancy. Save for a slight darkening of the air, nothing was visible of him. He went on:
"With our limited senses we are, in a way, merely peeping out of little slits in an armored conning-tower of life, out at the stupendous vibratory battles of the cosmos. Other creatures, in other planets, no doubt have other sense-organs to absorb other vibratory ranges. Their life-experiences are so different from ours that we could not possibly grasp them, any more than a blind man could understand a painting.
"Nor could those creatures understand human life. We are safe in our own little corner of the universe, comfortably sheltered in our vestments of clay. And what we cannot understand, though it is all perfectly natural, we call religion, the supernatural, God."
From a great vacancy, the Master's words proceeded. Leclair, tugging in vain at the bonds that, invisible yet strong as steel, held him powerless, stared with wild eyes.
"There is no supernatural," said the now disembodied voice. "What we call spirit, psychic force, hypnosis, spiritualism, the fourth dimension, is really only life on another scale of vibration. If we could see the whole scale, we would recognize it as a vast, coherent, perfectly natural and rational whole, in which we human beings fill but a very insignificant part. That, monsieur, is absolutely true!