The sense, as of separation, which a savage dreamer or seer would feel after a dream or vision in which he visited remote places, would satisfy him that _his_ soul, at least, was volatile. But some experience of what he would take to be visits from the spirits of others, would be needed before he recognised that other men, as well as he, had the faculty of sending their souls a journeying. Now, ordinary dreams, in which the dreamer seemed to see persons who were really remote; would supply to the savage reasoner a certain amount of affirmative evidence. It is part of Mr. Tylor's contention that savages (like some children) are subject to the difficulty which most of us may have occasionally felt in deciding 'Did this really happen, or did I dream it?' Thus, ordinary dreams would offer to the early thinker some evidence that other men's souls could visit his, as he believes that his can visit them. But men, we may assume, were not, at the assumed stage of thought, so besotted as not to take a great practical distinction between sleeping and waking experience on the whole. As has been shown, the distinction is made by the lowest savages of our acquaintance. One clear _waking_ hallucination, on the other hand, of the presence of a person really absent, could not but tell more with the early philosopher than a score of dreams, for to be easily forgotten is of the essence of a dream. Savages, indeed, oddly enough, have hit on our theory, 'dreams go by contraries.' Dr. Callaway illustrates this for the Zulus, and Mr. Scott for the Mang'anza. Thus they _do_ discriminate between sleeping and waking. We must therefore examine _waking_ hallucinations in the field of actual experience, and on such recent evidence as may be accessible. If these hallucinations agree, in a certain ratio, beyond what fortuitous coincidence can explain, with real but unknown events, then such hallucinations would greatly strengthen, in the mind of an early thinker, the savage theory that a man at a distance may, voluntarily or involuntarily, project his spirit on a journey, and be seen where he is not present.