y the
person holding the receiver. Now note this: the sound vibrations do not
travel at all; instead, they are transformed into electric waves, which
in turn are transformed at the receiving end of the line into sound
vibrations once more. And unless the receiving apparatus be present, and
properly adjusted, there is no second transformation at all; and in such
case the electric vibrations remain such.

Example of Wireless Telegraphy.

Likewise, in the case of the wireless telegraphy, the electric energy
produced by the sending instrument is transformed into subtle and finer
etheric waves, which travel to the receiving instrument, and are there
transformed into electric waves, the latter producing physical changes
in the receiving apparatus which enable them to be read by the observer.
In the case of wireless telephony there is still more complex process of
transformation, as follows: the speaker conveys sound vibrations into
the instrument; these are transformed into electric vibrations; and the
latter into the etheric vibrations which travel through space to the
receiver. Reaching the receiver, the etheric vibrations are transformed
into ordinary electric vibrations, and these in turn into sound waves
capable of being sensed by the listener.

Example of Light Waves.

The same process is detected in the transmission of what we call light
waves. The activities manifested by the substance of the sun set up
certain vibrations which we call "light vibrations." These are
communicated to the ether in the form of so-called "light waves" but
which are merely etheric waves of a certain rate of vibration. These
waves travel through space and are transformed into "light" only when
they reach some material substance capable of receiving and reflecting
their vibrations. Science tells us that empty space is perfectly DARK,
and that light manifests only when the etheric light vibrations come in
contact with material substance and are there transformed into "light."
Light, as "light" does not travel from the sun--what we know as "light"
is simply the result of the transformation of certain etheric waves into
"light" by reason of their contact with material substances.

Transformation of Mental Vibrations

Now for the analogy. Mental vibrations are so only when they remain in
their own uninterrupted medium of channel of activity, i.e., the brain
and the nervous system of the individual. Many hold that they are able
to leap