You will understand the difference and distinction between physical-sense telepathy, and astral-sense telepathy, if you will carefully consider the nature of each, as I shall now present it to you. I ask your close attention to what I shall have to say on this subject in the remaining pages of this chapter. Do not pass over these explanations as "dry," for unless you have a clear fundamental understanding of the thing, you will never be able to get the best results. This is true of every phase of learning, physical as well as psychical--one must get started right, in order to obtain the best results. In the first place, every thought process, every emotional activity, every creation of ideas, is accompanied by a manifestation of force--in fact, is the result of the manifestation of a force. Without entering at all into the question of what mind is, in itself, we may rest firmly on the natural fact that every manifestation of mental or emotional activity is the result of an action of the brain or nervous system, manifesting in a form of vibrations. Just as in the case of the manifestation of electricity in which certain chemical elements are consumed, or transformed, so in the case of mental or emotional activity there is a consuming or transformation of the substance of which the nervous system is composed. When I say "nervous system" in this connection, I include the brain, or brains of man--for these are but a part of his great nervous system in which all emotional or mental activity is manifested. Moreover, just as there is no real destruction of matter in any of Nature's processes--all seeming destruction being but a transformation--so in the case before us there is a transformation of the energy released in the thought or emotional process. We may grasp this idea more clearly if we consider what takes place into transformation of electrical energy. For instance, transmit a strong current of electricity over a fine wire, or filament of carbon, and lo! the current is transformed into light. Use another kind of channel of transmission, and the current is transformed into heat. Every electric light, or electric heating apparatus is proof of this. In the same way, the electric current is sent into space in the form of wireless waves. These waves coming in contact with certain forms of apparatus are transformed into forms of force which are registered and interpreted by the wireless operator.