Nearly a year elapsed before the Association received any further advices from their traveller, his next letter being dated from Cairo, upon his arrival in Egypt from Arabia. As the unfortunate state of his health prevented him, upon this occasion, from entering into any particulars of his Arabian journey, it is right to inform the reader, that in the following year he transmitted to the Association the most accurate and complete account of the Hedjaz, including the cities of Mekka, and Medina, which has ever been received in Europe. His knowledge of the Arabic language and of Mohammedan manners had now enabled him to assume the Mussulman character with such success, that he resided at Mekka, during the whole time of the pilgrimage, and passed through the various ceremonies of the occasion, without the smallest suspicion having arisen as to his real character. Upon one occasion, when the Pasha of Egypt, Mohammed Aly, then holding his head quarters at Tayf, to the eastward of Mekka, and who was not altogether ignorant of Burckhardt’s connexion with England, thought proper to put his qualifications as a Mussulman to the test, by directing the two most learned professors of the law, then in Arabia, to examine him upon his knowledge of the Koran, and of the practical as well as doctrinal precepts of their faith, the result was a complete conviction upon the minds of his hearers, or at least of his two examiners, of his being not only a true but a very learned Mussulman. It was his firm conviction, that the title of Hadji, which his pilgrimage gave him the right to assume, would be of the greatest use to him in his future travels in the interior of Africa. Important however as were the experience and information acquired by his journey in Arabia they were too dearly purchased; for there can be little doubt, that his constitution never recovered from the effects of that fatal climate, which has always proved pernicious to Europeans.[9] The severe attacks of fever and dysentery, which he suffered in Arabia, appear to have been the ultimate cause of the fatal termination of the disorder which, two years afterwards, in closing at once his labours and his existence, destroyed the best founded hopes of success, in exploring the unknown regions of Africa, which the Association had ever formed. The following is an extract of the letter from Cairo, already alluded to. It was dated the 25th June, 1815, and addressed to Sir Joseph Banks.