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With this thought in our minds it is easy to move a step further, and grasp the idea that astral vir.ion, or rather astral perception, may from one point of view be defined as the capability of receiving an enormously increased number of different sets of vibrations. In our physical bodies one small set of vibrations is perceptible to us as sound; another small set of much more rapid vibrations affects us as light; and again another set as electric action; but there are immense numbers of intermediate vibrations which produce no result which our physical senses cart cognize at all. Now it will readily be seen that if all, or even some only, of these intermediates, with all the complications producible by differences of wave-length, are perceptible on the astral plane, our comprehension of nature might be very greatly increased on that level, and we might be able to acquire much information which is now hidden from us. •
It is admitted that some of these vibrations pass Ill
through solid matter with perfect ease, so that this enables us to account scientifically for the peculiarities of etheric vision,