And, more than this, science knows that below the lowest red
vibrations, and above the highest violet vibrations, there are other
vibrations which our senses are unable to record, but which scientific
instruments register. The rays of light by which photographs are taken are
not perceived by the eye. There are a number of so-called chemical rays of
light which the eye does not perceive, but which may be caught by delicate
instruments. There is what science has called "dark light," which will
photograph in a room which appears pitch dark to the human sight.
Above the ordinary scale of light vibrations are the vibrations of the
X-Rays and other fine forces--these are not perceived by the eye, but are
caught by delicate instruments and recorded. Moreover, though science has
not as yet discovered the fact, occultists know that the vibrations of
mental and emotional states are just as true and regular as are those of
sound or light, or heat. Again, above the plane of the physical vibrations
arising from the brain and nervous system, there are the vibrations of the
astral counterparts of these, which are much higher in the scale. For even
the astral faculties and organs, while above the physical, still are under
the universal rule of vibration, and have their own rate thereof.
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