The Jinn are not immortal; they are to survive mankind, but to die before the general resurrection. Even at present many of them are slain by other Jinn, or by men; but chiefly by shooting-stars hurled at them from Heaven. The fire of which they were created, circulates in their veins instead of blood, and when they receive a mortal wound, it bursts forth and consumes them to ashes. They eat and drink, and propagate their species. Sometimes they unite with human beings, and the offspring partakes of the nature of both parents. Some of the Jinn are obedient to the will of God, and believers in the Prophet, answering to the Peries of the Persians; others are like the Deevs, disobedient and malignant. Both kinds are divided into communities, and ruled over by princes. They have the power to make themselves visible and invisible at pleasure. They can assume the form of various animals, especially those of serpents, cats, and dogs. When they appear in the human form, that of the good Jinnee is usually of great beauty; that of the evil one, of hideous deformity, and sometimes of gigantic size. When the Zôba'ah, a whirlwind that raises the sand in the form of a pillar of tremendous height, is seen sweeping over the desert, the Arabs, who believe it to be caused by the flight of an evil Jinnee, cry, Iron! Iron! (_Hadeed!_ _Hadeed!_) or Iron! thou unlucky one! (_Hadeed! yâ meshoom!_) of which metal the Jinn are believed to have a great dread. Or else they cry, God is most great! (_Allâhu akbar!_) They do the same when they see a water-spout at sea; for they assign the same cause to its origin.[47] The chief abode of the Jinn of both kinds is the Mountains of Kâf, already described. But they also are dispersed through the earth, and they occasionally take up their residence in baths, wells, latrinæ, ovens, and ruined houses.[48] They also frequent the sea and rivers, cross-roads, and market-places. They ascend at times to the confines of the lowest heaven, and by listening there to the conversation of the angels, they obtain some knowledge of futurity, which they impart to those men who, by means of talismans or magic arts, have been able to reduce them to obedience.[49] The following are anecdotes of the Jinn, given by historians of eminence.[50] It is related, says El-Kasweenee, by a certain narrator of traditions, that he descended into a valley with his sheep, and a wolf carried off a ewe from among them; and he arose and raised his voice, and cried, "O inhabitant of the valley!" whereupon he heard a voice saying, "O wolf, restore him his sheep!" and the wolf came with the ewe and left her, and departed.