We had been, in all, thirty-nine days from Tripoli, a considerable portion of which time was spent in travelling. This makes a long journey; but I am told that our camel-drivers should have brought us by way of Sebha, and thus effected a saving of three or four days. The greater portion of our sandy journey was unnecessary, and merely undertaken that these gentlemen might have an opportunity of visiting their wives and families. On a retrospective view of the route from Tripoli to Mourzuk, _viâ_ Mizdah, I am inclined to divide the country, for convenience sake, into a series of zones, or regions. 1st zone. This includes the sandy flat of the suburbs of the town of Tripoli, with the date-palm plantations and the sand-hills contiguous. 2d zone. The mountains, or Tripoline Atlas, embracing the rising ground with their influence on the northern side, and the olive and fig plantations, covering the undulating ground on the southern side, where the Barbary vegetation is seen in all its vigour and variety. This may also be emphatically called the region of rain. 3d zone. The limestone hills and broad valleys, gradually assuming the aridity of the Sahara as you proceed southward, between the town of Kaleebah and Ghareeah; the olive plantations and corn-fields disappear, entirely in this tract. 4th zone. The Hamadah, an immense desert plateau, separating Tripoli from Fezzan. 5th zone. The sandy valleys and limestone rocks between El-Hasee and Es-Shaty, where herbage and trees are found, affording food to numerous gazelles, hares, and the wadan. 6th. The sand between Shaty and El-Wady, piled in masses, or heaps, extending in undulating plains, and occasionally opening in small valleys with herbage and trees. 7th. The sandy valleys of El-Wady, covered with forests of date-palms, through which peep a number of small villages. 8th. The plateau of Mourzuk, consisting of shallow valleys, ridges of low sandstone hills, and naked flats, or plains, sometimes of sand, at others covered with pebbles and small stones. All these zones beyond the Atlas are visited by only occasional showers, or are entirely without rain, the vegetation depending upon irrigation from wells. I do not go into further detail on this subject, because, although our line of route was new, this stretch of country is tolerably well known to the geographical reader.