We find among sensitive people all degrees of this kind of clairvoyance, from that of the man who gets a vague impression which hardly deserves the name of sight at all, up to the full possession of etheric and astral vision respectively. Perhaps the simplest method will be for us to begin by describing what would be visible in the case of this fuller development of the power, as the cases of its partial possession will then be seen to fall naturally into their places. Let us take the etheric vision first. This consists simply, as has already been said, in susceptibility to a far larger series of physical vibrations than ordinary, but nevertheless its possession brings into view a good deal to which the majority of the human race still remains blind. Let us consider what changes its acquisition produces in the aspect of familiar objects, animate and inanimate, and then see to what entirely new factors it introduces us. But it must be remembered that what I am about to describe is the result of the full and perfectly-controlled possession of the faculty only, and that most of the instances met with in real life will be likely to fall far short of it in one direction or another. The most striking change produced in the appearance of inanimate objects by the acquisition of this faculty is that most of them become almost transparent, owing to the difference in wave-length of some of the vibrations to which the man has now become susceptible. He finds himself capable of performing with the utmost ease the proverbial feat of "seeing through a brick wall," for to his newly-acquired vision the brick wall seems to have a consistency no greater than that of a light mist. He therefore sees what is going on in an adjoining room almost as though no intervening wall existed; he can describe with accuracy the contents of a locked box, or read a sealed letter; with a little practice he can find a given passage in a closed book. This last feat, though perfectly easy to astral vision, presents considerable difficulty to one using etheric sight, because of the fact that each page has to be looked at _through_ all those which happen to be superimposed upon it.