It is only in our lighter sleeps, when the spirit traverses superphysical planes more closely connected with the material, that we remember ALL that occurred. Most of us will agree that there are two distinct forms of mental existence--the one in which we are conscious of the purely superphysical, and the one wherein we are only cognisant of the physical. In the first-named of these two mental existences-- _i.e._ in swoons, sleep, and even death, consciousness is never entirely lost; we still think--we think with our spiritual or unknown brain; and when in the last-named state, _i.e._ in our physical wakefulness and life, we think with our material or known brain. Unknown brains exist on all sides of us. Many of them are the earth-bound spirits of those whose spiritual or unknown brains, when on the earth, were starved to feed their material or known brains; or, in other words, the earth-bound spirits of those whose cravings, when in carnal form, were entirely animal. It is they, together with a variety of elementary forms of superphysical life (_i.e._ phantasms that have never inhabited any kind of earthly body), that constantly surround us, and, with their occult brains, suggest to our known brains every kind of base and impure thought. Something, it is difficult to say what, usually warns me of the presence of these occult brains, and at certain times (and in certain places) I can feel, with my superphysical mind, their subtle hypnotic influences. It is the unknown brain that produces those manifestations usually attributed to ghosts, and it is, more often than not, the possessors of the unknown brain in constant activity, _i.e._ the denizens of the superphysical world, who convey to our organs of hearing, either by suggestion or actual presentation, the sensations of uncanny knocks, crashes, shrieks, etc.; and to our organs of sight, all kinds of uncanny, visual phenomena.