Dream is not merely a reproduction in new combinations of impressions made upon the mind unconsciously as well as consciously, forgotten as well as remembered. The fact must also be taken into account that in dream mental action is vastly increased and the flow of ideas so accelerated that if life be measured, as it should be, by the number of ideas that are presented by the mind, the life of dream is vastly longer than waking life. If the ideas that would occupy many waking hours are compressed into a sleep of one hour, the whole dream-life must have presented to the mind infinitely more ideas than the whole waking life. The wonder would be if, of this vast multitude, many were not found to be coincident with events of actual occurrence afterwards. A further explanation of dreams that appear to convey information from some external intelligence, or to be prophetic, will be found in this—that many things impress themselves upon the mind when we are not giving attention to them and, therefore, unconsciously to ourselves. We thus lose some of the links of association which, if they had been perceived, would have shown us the connection between the dream and the incidents to which the dream related and which, if we had known, would have stripped the coincidence of its marvellousness. Yet a further explanation will be found in the exaltation of the mental faculties in dream, which enables us often to perceive, more clearly than in our waking state, ideas and chains of ideas and to think about them more correctly than is practicable in waking life, when the influx of external impressions represses to some extent the independent action of the mental faculties.