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Updated: May 9, 2025
The wave-motion of the one is heaped up to an extraordinary degree of intensity, without producing any sensible effect upon the other. I may add that, with suitable precautions, the eye may be placed in a focus competent to heat platinum to vivid redness, without experiencing any damage, or the slightest sensation either of light or heat.
Next remember that these waves are not composed of advancing particles of the medium but pass onwards by the push which each particle in the line of motion gives to the particle next to it, and then you will see that if there were a break of one fifty-thousandth part of an inch in the connecting ether between our eye and any source of light we could not receive light from that source, for there would be nothing to continue the wave-motion across the gap.
In the earliest writings of the ancients we find the notion that sound is conveyed by the air. Aristotle gives expression to this notion, and the great architect Vitruvius compares the waves of sound to waves of water. But the real mechanism of wave-motion was hidden from the ancients, and indeed was not made clear until the time of Newton.
But we cannot hope to be acquainted directly with the quality in the physical object which makes it look blue or red. Science tells us that this quality is a certain sort of wave-motion, and this sounds familiar, because we think of wave-motions in the space we see.
When the vessel is square, a splendid chequer-work is produced by the crossing of the direct and reflected waves. Thus, in the case of wave-motion, the most ordinary causes give rise to most exquisite effects. The words of Emerson are perfectly applicable here: The most impressive illustration of the action of waves on waves that I have ever seen occurs near Niagara.
For instance, the translatory motion of a mass of matter can be imparted to another mass by simple impact, but translatory motion cannot be imparted to the ether, and, for that reason, a body moving in it is not subject to friction, and continues to move on with velocity undiminished for an indefinite time; but the vibratory motion which constitutes heat is transformable into wave-motion in the ether, and is transmitted away with the speed of light.
Light and heat and sound are all due to wave-motions, which travel from the body emitting them to the person who sees light or feels heat or hears sound. That which has the wave-motion is either aether or 'gross matter', but in either case is what the philosopher would call matter.
It is sometimes said that 'light is a form of wave-motion', but this is misleading, for the light which we immediately see, which we know directly by means of our senses, is not a form of wave-motion, but something quite different something which we all know if we are not blind, though we cannot describe it so as to convey our knowledge to a man who is blind.
The vibratory motion we call heat; the wave-motion we call sometimes radiant energy, sometimes light. Neither of these terms is a good one, but we now have no others. It is conceded that it is not proper to speak of the wave-motion in the ether as heat; it is also admitted that the ether is not heated by the presence of the wave or, in other words, the temperature of the ether is absolute zero.
Now unmuted and unrestrained in conflict of crashing chords, the trumpet blows again the motto of the roving sea. In various figures is the pelagic motion, in continuous coursing strings, in the sweeping phrase of the woodwind, or in the original wave-motion of the horns, now unmuted. The main burden is a plaint
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