At this point, however, I must ask the student to consider the idea of psychic vibrations and their inductive power. It is a great principle of occultism, as well as of modern science, that everything is in a state of vibration--everything has its own rate of vibration, and is constantly manifesting it. Every mental state is accompanied by vibration of its own plane: every emotional state or feeling has its own particular rate of vibration. These rates of vibrations manifest just as do the vibrations of musical sound which produce the several notes on the scale, one rising above the other in rate of vibration. But the scale of mental and emotional states is far more complex, and far more extended than is the musical scale; there are thousands of different notes, and half-notes, on the mental scale. There are harmonies and discords on that scale, also. To those to whom vibrations seem to be something merely connected with sound-waves, etc., I would say that a general and hasty glance at some elementary work on physical science will show that even the different shades, hues and tints of the colors perceived by us arise from different rates of vibrations. Color is nothing more than the result of certain rates of vibrations of light recorded by our senses and interpreted by our minds. From the low vibrations of red to the high vibrations of violet, all the various colors of the spectrum have their own particular rate of vibration. 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. The old occult axiom: "As above, so below; as below, so above" is always seen to work out on all planes of universal energy.