If however you ask me what amount of truth or reality there has been in these dreams and visions, I should reply, as about poetry and prophecy, that some of these imaginations have represented realities, some unrealities; but that the total result to which they have led men, the belief in the immortality of the soul, is a reality. But when I speak of a “real vision” of a spirit or ghost, I hope you will not misunderstand me so far as to suppose that I could mean a material, gas-like (though intangible) form, occupying so many cubical inches of space. A spirit, so far as I conceive it, does not occupy space; nor is it the object of sight, any more than of smell or touch; it is, to me, of the nature of a thought, only a thought personified, _i.e._ a thought capable of loving and being loved, of hating and being hated. But though it may not be the object of the senses in the same way in which external things are, it may be manifested to the Imagination, _i.e._ the mind’s eye, in such a way as to produce the same effect as though it were an external object seen by the body’s eye. Every one who loves truth will tread with cautious steps in this mysterious province of phantasmal existence, and carefully measure his language, knowing that we are in a region of illusion, exaggeration, and (sometimes) of imposture. But there does seem evidence to show that people (mostly perhaps twins), at a distance from one another, have in some at present inexplicable manner influenced one another so that the disease or death or calamity of one has been simultaneously made known to the other; and you have probably read of cases, fairly supported, which would show that a passionate longing on the part of a dying man to see some distant friend may create a responsive emotion, if not an actual vision, in the mind of that friend. We are so completely in the dark as to the originating causes (for physiology tells us nothing but the instrumental causes) which produce our thoughts, that I see nothing at all absurd in the notion that every truthful and vivid conception of one human being in the mind of another upon earth, arises from some communion in the spirit-world between the spirits of the two.