Modern science furnishes abundant testimony to support and substantiate the teachings of the ancient Hindu sages to the effect that everything in the Universe is in constant motion, which is manifested by varying rates, degrees, and modes of vibration. The modern scientists, alike with the ancient occultist, knows that the differences between the things of the Universe arise mainly from the different rates, modes, and degrees of the vibrations manifested in the things themselves. If we change the vibration of a thing, we practically change the manifested nature of that thing. The difference between solid ice, liquid water, semi-gaseous vapor, and gaseous steam is simply the difference 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.