Almost all persons dream, and while dreaming they see and hear, touch and taste, without questioning for a moment the reality of these experiences. The dreaming person loses sight of the fact that he is in a bedroom of a particular house, that he has certain relations with others sleeping in the same house. He loses sight of the fact that his name is, let us say, Henry, and that he is famous for the manufacture of a particular brand of soap or cheese. For him, and as long as it lasts, the dream is the one reality. Now the question of the philosopher has always been: which is the true dream, the sleeping dream or the waking dream? The fact that the one is continuous of itself while the other is not, and that we always fall into a new dream but always wake to the same reality, has given a permanent value to the waking or external life, and an equally fictitious one to the interior or dreaming life. But what if the dream life became more or less permanent to the exclusion of all other memories and sensations? We should then get a case of insanity in which hallucination would be symptomic. (The dream state is more or less permanent with certain poetical temperaments, and if there is any insanity attaching to it at all, it consists in the inability to react.) Imagination, deep thought and grief are as much anaesthetic as chloroform. But the closing of the external channels of sensation is usually the signal for the opening of the psychic, and from all the evidence it would seem that the psychic sense is more extensive, acuter and in every way more dependable than the physical. I never yet have met the man or woman whose impaired eyesight required that he or she should use glasses in order to see while asleep. That they do see is common experience, and that they see farther, and therefore better, with the psychic sense than with the physical has been often proved. Emanuel Swedenborg saw a fire in Stockholm when he was resident in England and gave evidence of it before the vision was confirmed by news from Sweden. A lady of my acquaintance saw and described a fire taking place at a country seat about 150 miles away, the incident being true to the minutest details, many of which were exceptional and in a single instance tragic. The psychic sense is younger than the physical, as the soul is younger than the body, and its faculty continues unimpaired long after old age and disease have made havoc of the earthly vestment. The soul is younger at a thousand years than the body is at sixty. Let it be admitted upon evidence that there are two sorts of sense perception, the physical and the psychical, and that in some persons the latter is as much in evidence as the former. We have to enquire then what relations the crystal or other medium has to the development and exercise of the clairvoyant faculty. We know comparatively little about atomic structure in relation to nervous organism. The atomicity of certain chemical bodies does not inform us as to why one should be a deadly poison and another perfectly innocuous. We regard different bodies as congeries of atoms, but it is a singular fact that of two bodies containing exactly the same elements in the same proportions the one is poisonous and the other harmless. The only difference between them is the atomic arrangement.