erence caused by
various rates of vibration caused by heat. The difference between red
and blue, green and violet, is simply that caused by varying rates of
vibration. Light and heat, as well as sound, depend for the differences
upon rates of vibration.

Super-Sensible Vibrations.

Moreover, as every text book on science informs us, there are sounds too
low as well as those too high for the human ear to register, but which
are registered by delicate instruments. Again, there are colors beyond
the place of red, at one end of the visible spectrum; and others beyond
the place of violet at the other end of that spectrum, which the human
eye is unable to register and detect, but which our apparatus in the
laboratory plainly register. The ray of light which registers on the
photographic plate, and which causes sunburn on our skin, is too high a
rate of vibration for our eyes to perceive. Likewise the X-Rays, and
many other of the finer rays of light known to science are imperceptible
to the unaided human vision--they are actually "dark rays" so far as the
human eye is concerned, though man has devised instruments by means of
which they may be caught and registered.

The Higher Vibrations

The vibrations of magnetism and electricity are imperceptible to our
sight, though they may be registered by the appropriate apparatus; and
if we had the proper sense of apparatus to perceive them, these rays of
vibratory force would open up a whole new world to us. Likewise, if we
could increase our power of hearing-perception, we would seem to be
living in a new world of sights and sounds now closed to us. Reasoning
along the same lines of thought, many great thinkers have held that
there is no reason for doubting the possible existence of other
world-planes of being, just as real and as actual as the one upon which
we live, and move, and have our being, but which is forever invisible to
the ordinary human sight and senses; the apparent nothingness of such
worlds arising solely from the great difference in the rates of
vibrations between the two planes of being.

Unseen Worlds.

Listen to what careful thinkers have said concerning the possibility of
entire worlds existing in the same space occupied by us, but of which we
are unconscious by reason of our failure to sense their vibrations: One
says, "All our sensations are due to the impact upon our sense-organs of
vibrations in some form. Variations in the strength and rapidity