Stricken memory, yearning emotion, kindled fancy, a sensitive and timorous observation of natural phenomena, rustling leaves, wavering shadows, apparent effects of unknown causes, each is a superstitious mother of beliefs. The Sonora Indians say that departed souls dwell among the caves and rocks of the cliffs, and that the echoes often heard there are their voices. Ruskin suggests that the cause of the Greeks surrounding the lower world residence of Persephone with poplar groves was that "the frailness, fragility, and inconstancy of the leafage of the poplar tree resembled the fancied ghost people." We can very easily imagine how, in the breeze at the entrance to some subterranean descent, "A ghostly rank Of poplars, like a halted train of shades, Trembled." The operations of fierce passions, hate, fright, and rage, in a brain boiling with blood and fire, make pictures which the savage afterwards holds in remembrance as facts. He does not by reflection consciously distinguish the internal acts and sights of the mind from objective verities. Barbarians as travellers and psychologists have repeatedly observed usually pay great attention to the vagaries of madmen, the doings and utterances of the insane. These persons are regarded as possessed by higher beings. Their words are oracles: the horrible shapes, the grotesque scenes, which their disordered and inflamed faculties conjure up, are eagerly caught at, and such accounts of them as they are able to make out are treasured up as revelations. This fact is of no slight importance as an element in the hinting basis of the beliefs of uncultivated tribes. Many a vision of delirium, many a raving medley of insanity, has been accepted as truth.3 Another phenomenon, closely allied to the former, has wrought in a similar manner and still more widely. It has been a common superstition with barbarous nations in every part of the world, from Timbuctoo to Siberia, to suppose that dreams are real 2 Lib. i. cap. 60. 3 De Boismont, Rational History of Hallucinations, ch. 15: Of Hallucinations considered in a Psychological, Historical, and Religious Point of View. adventures which the soul passes through, flying abroad while the body lies, a dormant shell, wrapped in slumber. The power of this influence in nourishing a copious credulity may easily be imagined.