that the average height of the peaks reaches 12,000 feet, it will be seen that only at one spot is the altitude below 8500, and probably in few others reaches much below 9000, and where the exception is found, probably only in cases of tortuous gorges entirely hidden in a panorama such as presented itself from where we stood ourselves at an altitude of 6800 feet above the sea-level. Jibel Sirua, it is true, is connected with the main chain by a low ridge of peaks, and Unila stands more alone than any of the rest; but neither of these can reach the altitude of Miltsin and Tidili, which can be roughly estimated at some 13,000 feet. Although but very little snow was reported to have fallen as yet this winter, all the peaks were well covered, and judging from the altitude at which we were, and the fact that the _arar_—calitris—and evergreen oak abounded, I should estimate the snow-line at this particular period at 10,000 feet. However, as a general rule, no true estimate can be formed as regards the snow on the Atlas, for so much depends upon the severity of the winter or the heat of the summer; and to the best of my belief, based upon statements made to me on the spot, snow altogether disappears from the Atlas in very dry seasons, with the exception of sheltered spots and crevices. Probably the least snow is found about the end of October, after a previous dry winter and a hot summer. In May and June, before it has had time to melt, I have seen a far greater expanse of snow-capped peaks than I did on my return from Tafilet in December. Generally speaking, the deepest snow is found in March and the least in October. Descending from this elevation of 6800 feet by the bed of a now dry torrent, we continued our journey in an east by south direction, passing through one or two narrow gorges between rocks that were remarkably fine. It is no difficult matter to see that in winter and wet weather this road must be impassable, for the sole track is in the bed of the stream, and there were signs on the rocks of the water having risen to some six feet above the level of its stony course. Here one began to notice the first clear signs of the fact that while the valleys of the northern slopes of the Atlas run almost due north and south, those of the side on which we were take an east and west direction, parallel, in fact, to the backbone of the chain; the intermediate hills forming a small range along the foot of the southern side, such as is found, only at a greater distance away, on the north. I refer to the hills of Jibeelet and Rahamna.