The group of sleep-waking cases which we may next discuss illustrates a natural evolution of the faculty of the sleeping phase of personality. The subliminal self, exercising in sleep a profounder _influence_ over the organism than the supraliminal can exert, may also be presumed to possess a profounder _knowledge_ of the organism--of its present, and therefore of its future--than the supraliminal self enjoys. There are cases[92] in which the somnambulic personality is discerned throughout as a wiser self--advising a treatment, or at least foreseeing future developments of the disease with great particularity. Of course, in such a case prediction is often simply a form of suggestion; the symptom occurs simply because it has been ordained beforehand. In the case of cures of long-standing disease the sagacity which foresees probably co-operates with the control which directs the changes in the organism. The next stage is a very important one. We come to the manifestation in spontaneous sleep-waking states of manifestly supernormal powers,--sometimes of telepathy, but more commonly of clairvoyance or telæsthesia. Unfortunately, these cases have been, as a rule, very insufficiently observed. Still, it appears that in spontaneous somnambulism there is frequently some indication of supernormal powers, though the observers--even if competent in other ways--have generally neglected to take account of the hyperæsthesia and heightening of memory and of general intelligence that often accompany the state.