Here’s an interesting quote by William Walker Atkinson:

“And, more than this, any intelligent physical scientist will tell you that Science has every reason to believe that there are great fields of energy and force, the Vibrations of which are far too high for even the delicate instruments of science to record, but which nevertheless exist and manifest effects.

It was only the other day that Science was able to “catch” the “X-Rays” and other forms of high Radio-Activity, and yet these rays and forces had always existed. And tomorrow Science will perfect instruments capable of registering still higher forms of energy. And bye-and-bye, some scientist will perfect an instrument that will register and record the subtle vibrations of Thought, and perhaps in time some one will perfect that instrument so that it will not only record such Thought vibrations and waves, but, like the phonograph, it will be able to reproduce and send forth similar vibrations so that others may feel the thoughts, just as they now hear the sounds from the phonograph.

Such a prediction is no more wonderful than would have been the prediction of the telephone, the phonograph, the wireless telegraph and sundry other discoveries and inventions a hundred years ago.

Did you ever think that there are colors that the eye cannot see, but which delicate instruments clearly register? In fact, the rays of light which sunburn the face, and which register on the photographic plate are not visible to the eye. The eye sees the lower rays, but the higher ones are detected only by instruments adapted for the purpose. Your eye cannot see the X-Ray as it passes through the room, but the plate will catch it, and by its light a photograph may be made.

The rays of light visible to the eye are only the lower ones — the higher ones are far beyond the power of the eye to record, and beyond even the range of the most delicate instrument there exist rays and waves of light of such high vibratory rate as to defy even its power to record.

Did you ever know that there are sounds unheard by human ears that the microphone will catch and magnify? The scientific imagination dreams of instruments that will catch the songs of the mite-like insects and magnify them until they can be distinguished. There are waves of electricity that may pass through your body, unperceived by you, and yet powerful enough to run machinery or light electric lights. Listen to the words of certain eminent scientists:

And, so you see, that in the scientific theory of Vibrations, there may be found plenty of room for a scientific explanation of all that is claimed by the adherents of the truth of Mental Influence, without getting out of the region of physical science, and without invading the plane of metaphysics. And there are many more proofs from the same source, which we may touch upon as we proceed.

There is but one Truth, and it manifests on all planes — the Spiritual; the Mental; and the Physical — and its manifestations agree and coincide. So no Mentalist need fear the test of Physical Science, for each plane will bear out the facts and phenomena of the ones below or above it — the Three are but varying phases of the One.”