ral
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