As we approached the village, we witnessed a marvellous exhibition of colour that, even in our weather-beaten condition, impressed us with admiration. The steep ridges enclosing the valley were now thickly powdered with snow, but almost concealed from view by the clouds that hung low over our heads. Towards sunset these gradually rose up and melted into mist, and the whole scene was transfused with a delicate sea-green hue that seemed bright by contrast with the sombre tints in which we had been enveloped during the day. It often happens in bad weather that as the distant horizon is lit up towards sunset the rays, travelling under the dense strata of cloud that cover a mountain district, produce at that hour the effect of sudden illumination; but whether the green tint on this occasion was due to a similar colour in the distant horizon, unseen by us, or was complementary to the prevailing red colour of the surrounding rocks, we were unable to decide. About sunset we reached our house at Arround. The open verandah on this chilly evening, with the thermometer little over 40° Fahr., was not the most comfortable place for the evening toilet, nor for working in after supper. Under ordinary circumstances, two at least of the party would infallibly have been laid up with heavy colds or worse; but the last three weeks of open-air life in this fine climate had put us all into excellent condition. A moderate supper was despatched with general satisfaction, and no one suffered further inconvenience from the roughness of the day or the coldness of the night. As might have been expected from the unsettled state of the weather, the observations taken to determine the altitude of Arround had not been quite satisfactory. The heights deduced from comparison with Mogador, where the weather was also unsettled, were discordant to the extent of about 80 feet. A comparison of observations taken here and at Hasni, on the 13th and 15th inst., with a few hours’ interval, gave a much nearer agreement; and the mean of these, being 6,463 feet (1,970 m.), is that which we have adopted. A boiling-water observation at 8 P.M. in the evening, with the temperature of the air at 40° Fahr., gave a result higher by 20 feet; but it helps to show that the probable error is not large. The answers to our inquiries as to the Pass reached during the day were, as we had reason to believe, designedly vague and indefinite. It appears to be known as Tagherot, and to serve for communication with Tifinout, which is the name of a mountain district with one or more large villages, whose drainage is carried to the Sous. The main valley of the Sous must, however, lie to the south of Tifinout, and extend much farther east. Our corrected results make the point at which our last observation was taken, 4,821 feet above Arround, giving for the Tagherot Pass 5,021 feet above Arround, or 11,484 feet (3,500·4 m.) above the sea.