The limit of etheric sight when looking through solid matter appears to be analogous to that imposed upon us when looking through water or mist. We cannot see beyond a certain distance, because the medium through which we are looking is not perfectly transparent.
The appearance of animate objects is also considerably altered for the man who has increased his visual powers to this extent. The bodies of men and animals are for him in the main transparent, so that he can watch the action of the various internal organs, and to some extent diagnose some of their diseases.
The extended sight also enables him to perceive, more or less clearly, various classes of creatures, elemental and otherwise, whose bodies are not capable of reflecting any of the rays within the limit of the spectrum as ordinarily seen. Among the entities so seen will be some of the lower orders of nature-spirits—those whose bodies are composed of the denser etheric matter. To this class belong nearly all the fairies, gnomes, and brownies, about whom there are still so many stories remaining among Scotch and Irish mountains and in remote country places all over the world.
The vast kingdom of nature-spirits is in the main an astral kingdom, but still there is a large section of it which appertains to the etheric part of the physical plane, and this section, of course, is much more likely to come within the ken of ordinary people than the others. Indeed, in reading the common fairy stories one frequently comes across distinct indications that it is with this class that we are dealing. Any student of fairy lore will remember how often mention is made of some mysterious ointment or drug, which when applied to a man's eyes enables him to see the members of the fairy commonwealth whenever he happens to meet them.
The story of such an application and its results occurs so constantly and comes from so many different parts of the world that there must certainly be some truth behind it, as there always is behind really universal popular tradition. Now no such anointing of the eyes alone could by any possibility open a man's astral vision, though certain ointments rubbed over the whole body will very greatly assist the astral body to leave the physical in full consciousness—a fact the knowledge of which seems to have survived even to mediæval times, as will be seen from the evidence given at some of the trials for witchcraft. But the application to the physical eye might very easily so stimulate its sensitiveness as to make it susceptible to some of the etheric vibrations.
The story frequently goes on to relate how when the human being who has used this mystical ointment betrays his extended vision in some way to a fairy, the latter strikes or stabs him in the eye, thus depriving him not only of the etheric sight, but of that of the denser physical plane as well. (See The Science of Fairy Tales, by E. S. Hartland, in the "Contemporary Science" series—or indeed almost any extensive collection of fairy stories.) If the sight acquired had been astral, such a proceeding would have been entirely unavailing, for no injury to the physical apparatus would affect an astral faculty; but if the vision produced by the ointment were etheric, the destruction of the physical eye would in most cases at once extinguish it, since that is the mechanism by means of which it works.
Anyone possessing this sight of which we are speaking would also be able to perceive the etheric double of man; but since this is so nearly identical in size with the physical, it would hardly be likely to attract his attention unless it were partially projected in trance or under the influence of anæsthetics. After death, when it withdraws entirely from the dense body, it would be clearly visible to him, and he would frequently see it hovering over newly made graves as he passed through a churchyard or cemetery. If he were to attend a spiritualistic séance he would see the etheric matter oozing out from the side of the medium, and could observe the various ways in which the communicating entities make use of it.
Another fact which could hardly fail soon to thrust itself upon his notice would be the extension of his perception of colour. He would find himself able to see several entirely new colours, not in the least resembling any of those included in the spectrum as we at present know it, and therefore of course quite indescribable in any terms at our command. And not only would he see new objects that were wholly of these new colours, but he would also discover that modifications had been introduced into the colour of many objects with which he was quite familiar, according to whether they had or had not some tinge of these new hues intermingled with the old. So that two surfaces of colour which to ordinary eyes appeared to match perfectly would often present distinctly different shades to his keener sight.
We have now touched upon some of the principal changes which would be introduced into a man's world when he gained etheric sight; and it must always be remembered that in most cases a corresponding change would at the same time be brought about in his other senses also, so that he would be capable of hearing, and perhaps even of feeling, more than most of those around him. Now supposing that in addition to this he obtained the sight of the astral plane, what further changes would be observable?
Well, the changes would be many and great; in fact, a whole new world would open before his eyes. Let us consider its wonders briefly in the same order as before, and see first what difference there would be in the appearance of inanimate objects. On this point I may begin by quoting a recent quaint answer given in The Vâhan.