From Barka to Metemma we find alluvium as the general formation.
Water is scarce; even a month after the rainy season all the rivers are dried up, and water is only obtained by digging in the sand of the dry beds of the river Barka and its tributaries. When we passed through these plains many spots were still green; but a few months later we should have crossed a parched-up prairie little better than the desert itself.
Our pretty songsters of Ain were no more to be seen. The guinea-fowl was seldom met with, and only a few tiny antelopes wandered over the solitary expanse. Instead, we were aroused by the roar of the lion, the laugh of the hyena, and we had to protect our sheep and goats, as the spotted leopard was lurking around our tents.
On the 31st of October we reached Zaga, a large sloping plain situated at the junction of the Barka and the Mogareib. Water can be obtained at that spot by digging wells in the dried-up beds of the rivers, in sufficient quantity to have induced the Beni Amer to make it their winter encamping-ground.
We had that day made a very long march, on account of the absence of water on the road. Starting at two P.M., we only reached our halting ground (the bed of a dried-up winter torrent, a few hundred yards below the Beni Amer's camp), a couple of hours before daybreak. We were so sleepy and tired that during the latter part of the stage it had been with great difficulty that we managed to keep in the saddle; and no sooner did our guide give us the grateful intelligence that we had arrived, than we stretched on the ground the piece of tanned cowhide we carried with us, and covering ourselves with our cloaks, lay down to rest until daybreak. I offered to Mr. Marcopoli to share my "bedding," as his own had not arrived, and in a few minutes we both fell into that deep slumber that follows the exhaustion of a long weary march. I remember my disgust at being violently shaken by my bed companion; who, in a faint and trembling voice, whispered into my ear: "Look there!" I understood at once his look of anguish and terror, for two splendid lions, not more than twenty paces from us, were drinking near the wells that had been sank by the Arabs. I thought, and told my companion, that as we had no fire-arms with us; the wisest plan was to go to sleep and remain as quiet as possible. I set him the example, and only woke up late in the morning, when the sun was already high up and pouring its burning rays over my uncovered head. Marcopoli, with an absent terrified look impressed on his countenance, was still sitting near me. He told me that he had not slept, but kept watching the lions: they had remained for a long time, drinking, roaring and beating their sides with their tails; and even when they departed he kept listening to their dreadful roar, sounding more distant as the first rays of day appeared.