Clairvoyance, clairaudience, and second-sight are all related very closely. Every exercise of any one of them draws in at the same time both of the others. They are but variations of one power. Sound is one of the distinguishing characteristics of the Astral sphere, and as light goes with sound, sight obtains simultaneously with hearing. To see an image with the Astral senses means that at the same time there is a sound, and to hear the latter infers the presence of a related image in Astral substance. It is perfectly well known to the true student of occultism that every sound produces instantaneously an image, and this, so long known in the Orient, has lately been demonstrated in the West in the production to the eye of sound pictures on a stretched tympanum. This part of the subject can be gone into very much further with the aid of occultism, but as it is a dangerous one in the present state of society I refrain at this point. In the Astral Light are pictures of all things whatsoever that happened to any person, and as well also pictures of those events to come the causes for which are sufficiently well marked and made. If the causes are yet indefinite, so will be the images of the future. But for the mass of events for several years to come all the producing and efficient causes are always laid down with enough definiteness to permit the seer to see them in advance as if present. By means of these pictures, seen with the inner senses, all clairvoyants exercise their strange faculty. Yet it is a faculty common to all men, though in the majority but slightly developed; but occultism asserts that were it not for the germ of this power slightly active in every one no man could convey to another any idea whatsoever.