In our consideration of the Seven Minor Mental Planes, we have merely referred to the Three Elementary Planes in a general way. We do not wish to go into this subject in detail in this work, for it does not belong to this part of the general philosophy and teachings. But we may say this much, in order to give you a little clearer idea, of the relations of these planes to the more familiar ones--the Elementary Planes bear the same relation to the Planes of Mineral, Plant, Animal and Human Mentality and Life, that the black keys on the piano do to the white keys. The white keys are sufficient to produce music, but there are certain scales, melodies, and harmonies, in which the black keys play their part, and in which their presence is necessary. They are also necessary as "connecting links" of soul-condition; entity states, etc., between the several other planes, certain forms of development being attained therein--this last fact giving to the reader who can "read between the lines" a new light upon the processes of Evolution, and a new key to the secret door of the "leaps of life" between kingdom and kingdom. The great kingdoms of Elementals are fully recognized by all occultists, and the esoteric writings are full of mention of them. The readers of Bulwer's "Sanoni" and similar tales will recognize the entities inhabiting these planes of life. Passing on from the Great Mental Plane to the Great Spiritual Plane, what shall we say? How can we explain these higher states of Being, Life and Mind, to minds as yet unable to grasp and understand the higher subdivisions of the Plane of Human Mind? The task is impossible. We can speak only in the most general terms. How may Light be described to a man born blind--how sugar, to a man who has never tasted anything sweet--how harmony, to one born deaf? All that we can say is that the Seven Minor Planes of the Great Spiritual Plane (each Minor Plane having its seven sub-divisions) comprise Beings possessing Life, Mind and Form as far above that of Man of to-day as the latter is above the earth-worm, mineral or even certain forms of Energy or Matter. The Life of these Beings so far transcends ours, that we cannot even think of the details of the same; their minds so far transcend ours, that to them we scarcely seem to "think," and our mental processes seem almost akin to material processes; the Matter of which their forms are composed is of the highest Planes of Matter, nay, some are even said to be "clothed in Pure Energy." What may be said of such Beings?