There is a popular belief that in sleep the Soul sometimes quits the body and personally visits the scenes and persons of the dream which, in truth, is not all a dream. This is nothing more than a poetical fancy. There is no evidence of such journeying. The proof of it would be if the dreamer could tell us of actual occurrences passing elsewhere at the moment of his dream. There is, indeed, abundant evidence of mental communion in sleep, suggesting a dream that has relation to that distant person; but there is no satisfactory evidence of a positive perception of an event then passing far off. It is remarkable, indeed, that dreams to which this solution has been applied usually refer to something that is _to be_, or that _has been_, and not to events actually happening at the moment and which alone could be positively conclusively proved by reference to the persons whose sayings and doings are seen, heard and reported. The same remark applies to this as to prophecies generally. Why do they not tell us of something that _is doing_ far away, or something that _has been done_ in the distant past and therefore capable of verification? Surely the power that could prophesy the future, the dreaming that foreshadows what _is to be_, could, with vastly more ease, tell us what has been done or what is being done elsewhere at the moment of its exercise! Why is so simple a test invariably avoided? _Sympathetic_ dreams admit of another explanation. Two persons dream the same dream at the same time. They may be in the same room, in the same house, or far apart. The two dreams are not always identical in their details, but the main incident is substantially the same in both. The instances of this are too many to be accidental coincidences. The explanation is to be found in that _mental sympathy_ the existence of which cannot be doubted by any person who investigates psychological phenomena. The limit to which that sympathy extends is not yet measured. We know only that it is not bounded by the narrow range of the senses. Perhaps it is a purely _psychic_ faculty. If it be, we know as yet so little of the nature and powers of the Soul that it would be vain to speculate in what manner the operation is performed. But of this we may be assured, that, whatever the capacity of the Soul when we are waking and the external world is, as it were, pressing in upon us at all sides and occupying the whole mind, those powers are vastly extended when the material mechanism is at rest and the sleepless Soul alone is busy. If there be, under any conditions, communication between minds without the intervention of the senses, we may reasonably conclude that these would be greatly facilitated in the time of sleep, when the Soul is less subjected to the restraints of that mechanism by means of which it communicates with the _material_—that is to say, the _molecular_—world in which the present stage of its evolution is to be passed.