[Footnote 140: The imaginary rampart of Gog and Magog, which was
seriously explored and believed by a caliph of the ninth century,
appears to be derived from the gates of Mount Caucasus, and a
vague report of the wall of China, (Geograph. Nubiensis, p. 267 -
270. Memoires de l'Academie, tom. xxxi. p. 210 - 219.)]