One of these set in an exiguous but perennial stream towards India, especially Malabar, where, mixing with the people of the country, the Arab merchants became the progenitors of the Moplah race. The other was a partial emigration, also for commercial purposes, to the coast of Berberah, in Eastern Africa, where, mixing with the Galla tribes, the people of Hazramaut became the sires of the extensive Somali and Sawahil nations. Thus we have from Arabia four different lines of emigration, tending N.E. and S.E., N.W. and S.W. At some future time I hope to develop this curious but somewhat obscure portion of Arabian history. It bears upon a most interesting subject, and serves to explain, by the consanguinity of races, the marvellous celerity with which the faith of Al-Islam spread from the Pillars of Hercules to the confines of China-embracing part of Southern Europe, the whole of Northern and a portion of Central Africa, and at least three-fourths of the continent of Asia. [FN#6] Of this name M.C. de Perceval remarks, "Le mot Arcam etait une designation commune a tous ces rois." He identifies it with Rekem (Numbers xxxi. 8), one of the kings of the Midianites; and recognises in the preservation of the royal youth the history of Agag and Samuel. [FN#7] And some most ignorantly add, "after the entrance of Moses into the Promised Land." [FN#8] In those days, we are told, the Jews, abandoning their original settlement in Al-Ghabbah or the low lands to the N. of the town, migrated to the highest portions of the Madinah plain on the S. and E., and the lands of the neighbourhood of the Kuba Mosque. [FN#9] When describing Ohod, I shall have occasion to allude to Aaron's dome, which occupies the highest part. Few authorities, however, believe that Aaron was buried there; his grave, under a small stone cupola, is shown over the summit of Mount Hor, in the Sinaitic Peninsula, and is much visited by devotees. [FN#10] It must be remembered that many of the Moslem geographers derive the word "Arabia" from a tract of land in the neighbourhood of Al-Madinah. [FN#11] Khaybar in Hebrew is supposed to signify a castle. D'Herbelot makes it to mean a pact or association of the Jews against the Moslems. This fort appears to be one of the latest as well as the earliest of the Hebrew settlements in Al-Hijaz. Benjamin of Tudela asserts that there were 50,000 Jews resident at their old colony, Bartema in A.D. 1703 found remnants of the people there, but his account of them is disfigured by fable. In Niebuhr's time the Beni Khaybar had independent Shaykhs, and were divided into three tribes, viz., the Benu Masad, the Benu Shahan, and the Benu Anizah (this latter, however, is a Moslem name), who were isolated and hated by the other Jews, and therefore the traveller supposes them to have been Karaites. In Burckhardt's day the race seems to have been entirely rooted out. I made many inquiries, and all assured me that there is not a single Jewish family now in Khaybar.