Because many a pilgrim perished through a confidence in the lake-pictures of the mirage which led to carelessness about economising his skin of water, the mirage gained its present name--Bahr Sheitan, or Devil's Water. The 'Will o' wisp,' which appeared to promise the night-wanderer warmth or guidance, but led him into a bog, had its excellent directions as to the place to avoid perverted by an unhappy misunderstanding into a wilful falsehood, and has been branded ignis fatuus. Most of the mimicries in nature gradually became as suspicious to the primitive observer as aliases to a magistrate. The thing that seemed to be fire, or water, but was not; the insect or animal which took its hue or form from some other, from the leaf-spotted or stem-striped cats to that innocent insect whose vegetal disguise has gained for it the familiar name of 'Devil's Walking-stick;' the humanlike hiss, laugh, or cry of animals; the vibratory sound or movement which so often is felt as if near when it really is far; the sand which seems hard but sinks; the sward which proves a bog;--all these have their representation in the demonology of delusion. The Coroados of Brazil says that the Evil One 'sometimes transforms (himself) into a swamp, &c., leads him astray, vexes him, brings him into danger, and even kills him.' [153] It is like an echo of Burton's account. 'Terrestrial devils are those lares, genii, faunes, satyrs, wood-nymphs, foliots, fairies, Robin Good-fellows, trulli, &c., which, as they are most conversant with men, so they do them most harm. These are they that dance on heaths and greens, as Lavater thinks with Trithemius, and, as Olaus Magnus adds, leave that green circle which we commonly find in plain fields. They are sometimes seen by old women and children. Hieron. Pauli, in his description of the city of Bercino, Spain, relates how they have been familiarly seen near that town, about fountains and hills. 'Sometimes,' saith Trithemius, 'they lead simple people into the recesses of mountains and show them wonderful sights,' &c. Giraldus Cambrensis gives an instance of a monk of Wales that was so deluded. Paracelsus reckons up many places in Germany where they do usually walk about in little coats, some two feet long. [154] Real dangers beset the woods and mountain passes, the swamp and quicksand; in such forms did they haunt the untamed jungles of imagination!