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Updated: June 8, 2025


And as the electric force, the light waves, and the nerve-vibrations caused by the impact of the light-waves on the retina, are all expressions of the molecular changes which are taking place in the elements of the battery; so consciousness is, in the same sense, an expression of the molecular changes which take place in that nervous matter, which is the organ of consciousness.

These light-waves of objects on another globe it now conveys on its return journey to Mars, entering a receiving instrument and depicting the objects therein life-size.

You remember learning how light is turned back or reflected. Just as the light-waves come back again, so do the sound-waves; very quickly if the reflecting surface is near; after some time if it is far off. You know what an echo is. There is a lovely place where some children I know used often to go for a picnic.

We all know that a plant becomes pale and sickly if it has not sunlight, and the reason is, that without these light-waves it cannot get food out of the air, nor make the sap and juices which it needs.

One may therefore say with certainty that every physical phenomenon is a change in the direction, or velocity, or character, of the energy present, and such change has been produced by matter acting as a transformer. It has already been said that the absence of friction in the ether enables light-waves to maintain their identity for an indefinite time, and to an indefinitely great distance.

The wash of the light-waves in the atmosphere provokes many expressions of impatience from the astronomer, but it is often a beautiful phenomenon nevertheless. Between eta and delta is a fifth-magnitude double star, Sigma 725, which is worth a moment's attention. The primary, of a reddish color, has a very faint star, eleventh magnitude, at a distance of 12.7", p. 88°.

Unlike sound-waves, whose transmission requires air or other material media, light-waves pass freely through the vacuum of interstellar space. Even the hypothetical ether, held as the interplanetary medium of light in the undulatory theory, can be discarded on the Einsteinian grounds that the geometrical properties of space render the theory of ether unnecessary.

"Anxiously we have watched and waited for the discovery of an instrument that would respond to our projected light-waves and reveal to you the inhabitants of your neighboring planet. At last this momentous time has arrived. I congratulate you upon bringing it about."

A pane of clear glass, for instance, lets nearly all the light-waves pass through it, and therefore you often cannot see that the glass is there, because no light-messengers come back to you from it. Thus people have sometimes walked up against a glass door and broken it, not seeing it was there.

The film had not brought good results, either from sound-waves or light-waves, but, it will be remembered, there were wires running through it to give it rigidity, which, although necessary in my original experiments, must be avoided in connection with sound vibrations. Clearly my new film must not be rigid.

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