The fact that we are so readily able to influence the elemental kingdoms at once shows us that we have a responsibility towards them for the manner in which we use that influence; indeed, when we consider the conditions under which they exist, it is obvious that the effect produced upon them by the thoughts and desires of all intelligent creatures inhabiting the same world with them must have been calculated upon in the scheme of our system as a factor in their evolution. In spite of the consistent teaching of all the great religions, the mass of mankind is still utterly regardless of its responsibility on the thought-plane; if a man can flatter himself that his words and deeds have been harmless to others, he believes that he has done all that can be required of him, quite oblivious of the fact that he may for years have been exercising a narrowing and debasing influence on the minds of those about him, and filling surrounding space with the unlovely creations of a sordid mind. A still more serious aspect of this question will come before us when we discuss the artificial elemental; but in regard to the essence it will be sufficient to state that we undoubtedly have the power to accelerate or delay its evolution according to the use which consciously or unconsciously we are continually making of it. It would be hopeless within the limits of such a treatise as this to attempt to explain the different uses to which the forces inherent in the manifold varieties of this elemental essence can be put by one who has been trained in their management. The vast majority of magical ceremonies depend almost entirely upon its manipulation, either directly by the will of the magician, or by some more definite astral entity evoked by him for that purpose. By its means nearly all the physical phenomena of the _seance_-room are produced, and it is also the agent in most cases of stone-throwing or bell-ringing in haunted houses, such results as these latter being brought about either by blundering efforts to attract attention made by some earth-bound human entity, or by the mere mischievous pranks of some of the minor nature-spirits belonging to our third class. But the "elemental" must never be thought of as itself a prime mover; it is simply a latent force, which needs an external power to set it in motion. It may be noted that although all classes of the essence have the power of reflecting images from the astral light as described above, there are varieties which receive certain impressions much more readily than others--which have, as it were, favourite forms of their own into which upon disturbance they would naturally flow unless absolutely forced into some other, and such shapes tend to be a trifle less evanescent than usual.