The Mountains of Ḳáf, which bound the Circumambient Ocean and form a circular barrier round the whole of our earth, are described by interpreters of the Ḳur-án as composed of green chrysolite, like the green tint of the sky.[109] It is the colour of these mountains, said the Prophet, that imparts a greenish hue to the sky. It is said, in a tradition, that beyond these mountains are other countries; one of gold, seventy of silver, and seven of musk, all inhabited by angels, and each country ten thousand years' journey in length, and the same in breadth.[110] Some say that beyond it are creatures unknown to any but God:[111] but the general opinion is, that the mountains of Ḳáf terminate our earth, and that no one knows what is beyond them. They are the chief abode of the Jinn, or Genii. It has already been said that our earth is the first, or highest, of seven earths, which are all of equal width and thickness and at equal distances apart. Each of these earths has occupants. The occupants of the first are men, genii, brutes, etc.; the second is occupied by the suffocating wind that destroyed the infidel tribe of Ad; the third, by the stones of Jahennem (or Hell), mentioned in the Ḳur-án in these words, "the fuel of which is men and stones;"[112] the fourth, by the sulphur of Jahennem; the fifth, by its serpents; the sixth, by its scorpions, in colour and size like black mules and with tails like spears; the seventh, by Iblees and his troops.[113] Whether these several earths are believed to be connected with each other by any means, and if so how, we are not expressly informed; but, that they are supposed to be so is evident. With respect to our earth in particular, as some think, it is said that it is supported by a rock, with which the Mountains of Ḳáf communicate by means of veins or roots; and that when God desires to effect an earthquake at a certain place, He commands the mountain (or rock) to agitate the vein that is connected with that place.[114] But there is another account, describing our earth as upheld by certain successive supports of inconceivable magnitude, which are under the seventh earth; leaving us to infer that the seven earths are in some manner connected together. This account, as inserted in the work of one of the writers above quoted, is as follows:--The earth [under which appellation are here understood the seven earths] was, it is said, originally unstable; "therefore God created an angel of immense size and of the utmost strength, and ordered him to go beneath it [_i.e._ beneath the lowest earth] and place it on his shoulders; and his hands extended beyond the east and west, and grasped the extremities of the earth [or, as related in Ibn-El-Wardee, the seven earths] and held it [or them]. But there was no support for his feet: so God created a rock of ruby, in which were seven thousand perforations, and from each of these perforations issued a sea, the size