This work, which appeared in several editions in various European and Asiatic languages, is interesting reading because of the curious methods of travel and the novelty of the adventures. Incognito journeys had been made before my time to Mecca and Medina by Burton, Burckhart, Maltzan, Snouck-Hurgronje, and others, but as a Dervish living on alms, and undergoing all the penalties of fakirdom, I was certainly the first and only European. However interesting the account of my adventures may be, the geographico-scientific results of my journey are not in adequate proportion to the dangers and sufferings I underwent. Astronomical observations were impossible, neither was I competent to make them. Orography and hydrography were never touched upon. The fauna and flora were closed books to me, and as for geology, I did not even know this science by name before I came West. But on the other hand, I can point out with pleasure that in certain parts of Central Asia I was the first European traveller, and have contributed many names of places to the map of the region, and furnished many facts hitherto unknown about the ethnographical relations of the Turks in these parts. What made my book of travels popular was unquestionably the account of my adventures and the continual dangers in which I found myself. The European reader can hardly form any conception of my sufferings and privations; they evoked the interest and the sympathy of the cultured world; but he who has read the preceding pages, and is acquainted with the struggles of my childhood and youth, will not be surprised that the early schooling of misery and privation I underwent had sufficiently hardened me to bear the later heavy struggles. The difference between the condition of a poor Jew-boy and a mendicant Dervish in Central Asia is, after all, not very great. The cravings of hunger are not one whit easier to bear or less irksome in cultured Europe than in the Steppes of Asia, and the mental agony of the little Jew, despised and mocked by the Christian world, is perhaps harder than the constant fear of being found out by fanatical Mohammedans. As my first publication was so much appreciated, I enlarged, at the instigation of my friends, my first account, and published-- 2. _Sketches from Central Asia_,