With regard to the last-mentioned statement of the above letter, we know that Dr. Oudney was resolute in his determination not to travel under an assumed name and character. He was too sincere and conscientious a Christian ever to venture to lay aside the avowed practice of its duties for the attainment of any purpose whatsoever. He was strongly urged by some of his scientific friends to endeavour to control his scruples on this subject, and, like his predecessors in the same scheme of exploring Africa, to travel as an Arab and a disciple of Mahomet, but without success; and he declared that he would far rather abandon the enterprise to which he had been appointed, than even in appearance to renounce his faith. It so happened that the humour of the pasha of Tripoli, and the circumstances of his dominions at the time they were traversed by the mission to which Dr. Oudney was attached, favoured his design. It is quite clear neither Dr. Oudney nor his companions could have travelled in Africa as Mahometans, from their comparative ignorance of the languages of the east, and of the rites of the religion of the Arabian prophet. None of them had the preparatory training previous to the commencement of their journey as was enjoyed by Burckhardt and others; so that they must have been quickly detected as impostors had they assumed the profession of Islamism; and it is very true, as the Doctor remarks, that an exposed hypocrite is an odious character in any country. It is quite obvious, however, that the more familiar travellers are with the language of the people among whom they travel, and the better acquainted they are with their manners and customs, and their religious tenets and ceremonies, they will thereby best secure their confidence, and be the better enabled to adapt themselves to all circumstances, persons, and seasons, which they may meet with, as well as greatly increase their means of obtaining the knowledge of which they are in search. But whether Dr. Oudney’s declared resolution to travel as an Englishman and a Christian be approved of or not; or whether his conduct in this respect may or may not be imitated by others, every one must admire the honest sincerity of heart, and the unbending integrity of principle which his resolution manifested. There is another letter to his sister of the same date as the preceding, which likewise contains some facts worthy of being published. “_Tripoli, October 24_, 1821.