Propagated motion becomes transformed according to the medium it traverses. Motion always tends to propagate itself. Therefore, when we see work of any kind—mechanical, electrical, nervic, or psychic—disappear without visible effort, then of two things, one happens, namely, either a transmission or a transformation. Where does the first end, and where does the second begin? In an identical medium there is only transmission; in a different medium there is transformation.

"You send an electric current through a thick wire. You have the current, but you do not perceive any other force. But cut that thick wire, and connect the ends by means of a fine wire, and this fine wire will grow hot—there will be a transformation of a part of the current into heat. Take a pretty strong current, and interpose a wire still more resistant, or a very thin carbon rod, and the carbon will emit light. A part of the current, then, is transformed into heat and light. The light acts in every direction around about, first visibly as light, then invisibly as heat and electric current. Hold a magnet near it. If the magnet is weak and movable, in the form of a magnetic needle, the beam of light will cause it to deviate; if it is strong and immovable, it will in turn cause the beam of light to deviate. And all this from a distance, without contact, without special conductors.

Dynamic Correlate of Thought.

"A process that is at once chemical, physical and psychical, goes on in the brain. A complex action of this kind is propagated through the gray brain matter, as waves are propagated in water. Regarded on its physiological side, an idea is only a vibration, a vibration that is propagated, yet which does not pass out of the medium in which it can exist as such. It is propagated only as far as other vibrations allow. It is propagated more widely if it assumes the character which subjectively we call emotive. But it cannot go beyond without being transformed. Nevertheless, like force in general, it cannot remain in isolation, and it escapes in disguise.

"Thought stays at home, as the chemical action of a battery remains in the battery; it is represented by its dynamic correlate, called in the case of the battery a 'current,' and in the case of the brain, I know not what; but whatever its name may be, it is the dynamic correlate of thought. I have chosen the name 'dynamic correlate.' There is something more than that; the universe is neither dead nor void.

"A force that is transmitted meets other forces, and if it is transformed only little by little it usually limits itself to modifying another force at its own cost, though without suffering materially thereby. This is the case particularly with forces that are persistent, concentrated, well seconded by their medium. It is the case with the physiological equilibrium, nervic force, psychic force, ideas, emotions, tendencies. These modify environing forces, without themselves disappearing. They are imperceptibly transformed, and if the next man is of a nature exceptionally well adapted to them, they gain in inductive action."

Answer to Skeptical Critics

The two most likely objections advanced against this conception by sceptical critics are as follows: "(1) The mental vibratory motion, or vibratory waves, are not known to science, nor recorded on scientific instruments such as the galvanometer. What is the rate of such vibrations, and what is their general character? (2) Granted the existence of such vibratory energy, or thought-waves, how and by means of what channel does the second person receive them from the first person? How are they registered or recorded?" These objections are capable of being met in a scientific manner, to the satisfaction of any fair-minded critic or investigator. We shall now give you, briefly, the gist of the answer of science to the aforesaid objections.

The World of Vibrations

It is true that the scientific instruments of the laboratory, such as the galvanometer, do not record thought vibrations. This, because such instruments are capable of registering and recording on certain rates and modes of vibratory energy. Thought vibrations are registered only by their appropriate instruments, namely, the Chitta of Mind substance of living persons. As to the "general character and rate of vibration" of these waves of mental force, we can only say that their general character is that of "mental force" as opposed to "physical force."

As to their rate of vibration, we can only say that this is not precisely known, not having as yet been definitely ascertained; but it should be added that there is plenty room for these vibrations in the great field of vibratory energy. Read the following paragraphs, and decide this last matter for yourself.

Uncharted Seas of Vibration.

The following quotations from eminent scientists will serve to give the student a general idea of the views of science upon the question of the possibility of the existence and presence of vibratory energy of kinds and characters as yet unknown to science:

The first scientist says: "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: "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."

The third scientist says: "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."

The fourth scientist says: "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