All the rest of the afternoon, we saw mountains of a perfectly purple colour, all of them porphyry; nor has Ptolemy[151] much erred in the position of them. About four o’clock, we pitched our tent at a place called Main el Mafarek. The colour of the valley El Hamra continued to this station; and it was very singular to observe, that the ants, or pismires, the only living creatures I had yet observed, were all of a beautiful red colour like the sand.
The 20th, at six o’clock in the morning, we left Main el Mafarek, and, at ten, came to the mouth of the defiles. At eleven we began to descend, having had a very imperceptible ascent from Kenné all the way.
We were now indemnified for the sameness of our natural productions yesterday; for, on each side of the plain, we found different sorts of marble, twelve kinds of which I selected, and took with me.
At noon, we came to a plain planted with acacia-trees, at equal distances; single trees, spreading broader than usual, as if on purpose to proportion the refreshment they gave to the number of travellers who stood in need of it. This is a station of the Atouni Arabs after rain. From our leaving Legeta, we had no water that, nor the following day.
On the right-hand side of this plain we found porphyry and granite, of very beautiful kinds. All the way, on both sides of the valley, this day, the mountains were of porphyry, and a very few of stone.
At a quarter past four, we encamped at Koraim, a small plain, perfectly barren, consisting of fine gravel, sand, and stones, with a few acacia-trees, interspersed throughout.
The 21st, we departed early in the morning from Koraim, and, at ten o’clock, we passed several defiles, perpetually alarmed by a report, that the Arabs were approaching; none of whom we ever saw. We then proceeded through several defiles, into a long plain that turns to the east, then north-east, and north, so as to make a portion of a circle. At the end of this plain we came to a mountain, the greatest part of which was of the marble, _verde antico_, as it is called in Rome, but by far the most beautiful of the kind I had ever seen.
Having passed this, we had mountains on both sides of us, but particularly on our right. The only ones that I myself examined were of a kind of granite, with reddish veins throughout, with triangular and square black spots. These mountains continued to Mesag el Terfowey, where we encamped at twelve o’clock; we were obliged to bring our water from about five miles to the south-east. This water does not appear to be from springs, it lies in cavities and grottos in the rock, of which there are twelve in number, whether hollowed by nature or art, or partly by both, is more than I can solve. Great and abundant rains fall here in February. The clouds, breaking on the tops of these mountains, in their way to Abyssinia, fill these cisterns with large supplies, which the impending rocks secure from evaporation.