human
There is much food for speculation in the thought that there exists sound waves that no human ear can hear, and color waves that no eye can see. The long, dark, soundless space between 40,000 and 400,000,000,000,000 vibrations per second, and the infinity of range beyond 700,000,000,000,000 vibrations per second, where light ceases, in the universe of motion, makes it possible to indulge in speculation. The second scientist says:
gpt
There is no gradation between the most rapid undulations or tremblings that produce our sensation of sound, and the lowest of those which give rise to our sensations of gentlest warmth. There is a huge gap between them, wide enough to include another world of motion, all lying between our world of sound and our world of heat and light. And there is no good reason whatever for supposing that matter is incapable of such intermediate activity, or that such activity may not give rise to intermediate sensations, provided that there are organs for taking up and sensifying these movements.
human
The knowledge we gain by experiment brings home to us what a miserably imperfect piece of mechanism our bodies are. The ear can detect the slow-footed sound vibrations that come to us at the rate of between 40 and 40,000 a second. But the whole of space may be quivering and palpitating with waves at all sorts of varying speeds, and our senses will tell us nothing of them until we get them coming to us at the inconceivable speed of 400,000,000,000,000 a second, when again we respond to them and appreciate them in the form of light.
gpt
The first indications of warmth come to us when the vibrations reach the rate of 35,000,000,000,000 per second. When the vibrations reach 450,000,000,000,000 the lowest visible light rays manifest. Then come the orange rays, the golden yellow, the pure yellow, the greenish yellow, the pure green, the greenish blue, the ocean blue, the cyanic blue, the indigo, and finally the violet, the highest degree of light which the human eye can register, and which occurs when the vibrations reach the rate of 750,000,000,000 per second. Then come the ultra-violet rays, invisible to human sight but registered by chemical media. In this ultra-violet region lie the X-Rays, and the other recently discovered high degree rays; also the actinic rays which, while invisible to the eye, register on the photographic plate, sunburn one's face, blister one's nose, and even cause violent explosions in chemical substances exposed to them, as well as act upon the green leaves of plants, causing the chemical transformation of carbonic acid and water into sugar and starches. These forms of 'dark light,' that is, light too high in degree to be perceived by the human eye, are but faint indications of the existence of still higher and still finer vibrations of substance and energy.
human
Granted the existence of such vibratory energy, or thought-waves, how and by means of what channel does the second person receive these from the first person? How are they registered or recorded? This same question is also implied in the concluding sentence of one of the scientists above quoted, viz.:
gpt
There is no good reason whatever for supposing that matter is incapable of such intermediate activity, or that such activity may not give rise to intermediate sensations, provided that there are organs for taking up and sensifying these movements. Let us see what science has to tell us regarding the provision of Nature for the reception and