Although the scientist has found it useful on occasion to postulate the fourth dimension, he has not thought necessary as yet to put it in the category of reality; much less has the layman. Consequently the mathematician holds the sole title to its knowledge unless we recognize the claims of the medium to a fourth-dimensional insight. There is much, however, today which points to our coming to such perception as the natural result of our evolution and quite apart from geometrical abstractions or occultism. It is as though some great tidal wave had swept over space and we have, quite unbeknown to ourselves, been lifted by it to new heights. And when we have once obtained our spiritual balance we shall doubtless find that our space world has taken to itself another direction, inconceivable as that now seems. Space is more than room wherein to move about; it is, first of all, the room in which we think, and upon how we do so depends the number of its dimensions. If the attention has become 'riveted to the object of its practical interest' to the extent that this is the only good the creature knows, then is its thought-form one-dimensional even though its bodily movements are three-spaced. The great Peacock Moth wings a sure course mateward to the mystification of the scientist; the dog finds the direct road home - his master cannot tell how; Mary Antin climbs to an education over difficulties apparently insurmountable; Rockefeller knows his goal and attains it, regardless of other moral worths. For these the way is certain. They can suffer no deflection since there are no relative values, no possible choices. Their purpose makes the road one-dimensional. That the majority of persons are still feeling their way over the surface of things is attested by the general mental ineptitude for the study of solid geometry. Depth and height play little part in our physical perception. For most of us the third dimension is practically unknown beyond the reach of a few feet. A Beachey soaring aloft - why all the bravado of curve and loop? Sooner or later he will fall to his death. Ay, verily! but his is a joyous martyrdom making for the evolution of consciousness. Not always shall we crawl like flies the surface of our globe!