T he journey of which the following is an account, was made in company with the late Dr. Beke in quest of the true Mount Sinai, which mountain he placed in North-western Arabia, about 95 miles in a north-easterly direction from the district in which it has hitherto been conjecturally considered to exist. Owing to the rapidity with which the country visited was traversed, it would be impossible to connect with accuracy the various observations which were made; and therefore, rather than attempt to construct a series of sections showing the relation of the various formations to each other, I have considered it better simply to indicate the conditions as observed at various points, leaving it for those more conversant with the geology of these districts to connect the following fragments with those already accumulated. For assistance in the determination of the rock-specimens collected, of which 77 are described, 22 of which were examined microscopically, I have to thank Mr. Thomas Davies, F.G.S., of the British Museum. District visited .—From Suez we went by sea to Eynounah, which lies in the north-east corner of the Red Sea, and then on to Akaba, touching almost daily at some point or other along the coast. From Akaba we took camels, and journeyed some twenty miles in a north-easterly direction up Wady Ithm, in the direction of Petra and Maan. This was the furthest point of our journey. On again reaching Akaha, instead of returning to Suez by sea, as we had come, we had
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