Mr. Burckhardt remained two years and a half in Syria, making daily additions to his practical knowledge of the Arabic language, and to his experience of the character of Orientals, and of Mohammedan society and manners. His principal residence was at Aleppo. Having assumed the name of Ibrahim Ibn Abdallah at Malta, he continued to bear it in Syria; but apprehensive of not having yet had sufficient experience, thoroughly to act the part of a Mussulman, and finding no necessity for such a disguise at Aleppo, he was not studious to conceal his European origin, and wore only such a Turkish dress, as is often assumed in Syria by English travellers, less for the sake of concealment than to avoid occasional insult. Thus he had the benefit of an unmolested intercourse with the Mussulman population of Aleppo, at the same time that he was not prevented from openly accepting the friendship and protection of Mr. Barker, the British Consul, nor under the necessity of denying himself the social resources afforded by the houses of the European residents; especially those of Mr. Barker, and of Mr. Masseyk, formerly Dutch Consul. Of his obligations to the former of these gentlemen, he omitted no opportunity of bearing testimony. Besides two short tours which he made from Aleppo, he was absent from thence in the year 1810, for six months, during which time he visited Palmyra, remained three months at Damascus, and from thence made two journeys into the neighbouring districts; one through the Libanus and Anti-Libanus, and the other through the unexplored country of the Haouran, or Auranitis. After his final departure from Aleppo, in February 1812, he again made some stay at Damascus, and performed a second journey in the Haouran, including a part of the ancient Decapolis. Upon quitting Damascus for Egypt, he visited Tiberias and Nazareth, and from thence having crossed to the Eastern side of the Jordan, proceeded through the countries to the east and South of the Dead Sea, until he arrived at Wady Mousa, where he had the satisfaction of discovering the remains of a large ancient city, consisting of a great number of buildings and monuments excavated in the rocks, a singularity which, added to the testimony of ancient history, marks the place for the site of Petra, the capital of Arabia Petræa. From Wady Mousa he pursued a westerly course towards the capital of Egypt, across the valley of Araba, and the desert of El Tyh. A sketch of his travels in Syria is communicated in letters which he addressed from time to time to Sir Joseph Banks, or to Mr. Hamilton, Secretary of the Association. The following are extracts of the most interesting parts of this correspondence. _Aleppo, May 12,_ 1810.