Is it any more unreasonable to suppose that Nature has still a mine of undiscovered treasure in the mind and constitution of man, as well as in inorganic nature? No, friends, these things are as natural as the physical senses, and not a whit more of a miracle. It is only that we are accustomed to one, and not to the other, that makes the astral senses seem more wonderful than the physical. Nature's workings are all wonderful--none more so than the other. All are beyond our absolute conception, when we get down to their real essence. So let us keep an open mind! LESSON II. TELEPATHY vs. CLAIRVOYANCE. In this work I shall use the term "clairvoyance" in its broad sense of "astral perception," as distinguished from perception by means of the physical senses. As we proceed, you will see the general and special meanings of the term, so there is no necessity for a special definition or illustration of the term at this time. By "telepathy," I mean the sending and receiving of thought messages, and mental and emotional states, consciously or unconsciously, by means of what may be called "the sixth sense" of the physical plane. There is, of course, a form of thought transference on the astral plane, but this I include under the general term of clairvoyance, for reasons which will be explained later on. You will remember that in the preceding chapter I told you that in addition to the five ordinary physical senses of man there were also two other physical senses comparatively undeveloped in the average person. These two extra physical senses are, respectively, (1) the sense of the presence of other living things; and (2) the telepathic sense. As I also told you, these two extra physical senses have their astral counterparts. They also have certain physical organs which are not generally recognized by physiologists or psychologists, but which are well known to all occultists. I shall now consider the first of the two above-mentioned extra physical senses, in order to clear the way for our consideration of the question of the distinction between ordinary telepathy and that form of clairvoyance which is its astral counterpart.