Another sight, which would be humorous if it were not so pathetic, is to see these animals in the middle of the day trying to get a little shade from the blazing heat of the sun. The strongest of the flock will take up a position behind the trunk of a mimosa shrub, whereupon the remainder of the party attempt to benefit by crowding close up to him, one behind the other, until there is a long tail of these animals, huddled close behind each other, trying to get some satisfaction out of the shelter obtainable from the shadow of the sheep in front.

At In Ouzel the character of the desert had changed considerably. Here was more the popular conception of the Sahara, and rather what I had myself imagined it always to be.

A soft white sand covered the landscape on every side. At each step one sank into it for a depth of about a foot. The ground was undulating, and occasionally sand-dunes, rising to a height of as much as a hundred feet, were to be seen. Beyond the sparse grass no vegetation of any sort existed within sight of In Ouzel, but, in some of the more sheltered “oueds,” lying to the east of the well, was a tall shrub, with leaves somewhat resembling the Scotch fir. This was the plant on which the camels fed. It is called “ethel” in Arabic, and is fairly common in the Northern Sahara. I had not previously seen this desert shrub, but this, I fancy, was due to the desert soil I had hitherto encountered not being suited to its growth. The “ethel” appears to require a soft, sandy soil; at any rate, I never found it growing except in this particular kind of ground. “Ethel” shares with other Saharan flora the peculiarity of possessing thorns, or rather, in this case, spikes. It is a curious fact that every herb, plant, or tree in the desert seems to have some kind of a thorn growing upon it. The spikes on the “ethel” are perhaps less strong and hard than in the case of most other Saharan vegetation. It is rather strange how the camel eats these thorny morsels without apparently suffering any inconvenience therefrom. By a peculiar motion he seems to compress the thorns between the roof of his mouth and his tongue and tear them off. The “cram-cram” grass, of which the camel is excessively fond, and which is far more nourishing than the “Ethel,” was no longer to be seen. On quitting the Adrar we had left it behind. It does not appear to exist north of that country at all.

My Riding-camel in the Sahara

This picture shows my camel ready to be mounted after a midday halt, during which I had endeavoured to get some shade from a leafless stunted tree. My saddle was a Tuareg “rahla”; these are made with a curious cross in front. All the paraphernalia of the march is hung ready on the saddle, e.g. rifle, water-bottle, haversack, and camera. My ammunition I used to carry in a bandolier slung round the shoulder.

In the Sahara there are two kinds of plants, generally speaking—plants which do not die if they get no rain during the year, and plants which only spring up annually if there has been rain. The former species is rather interesting on account of the following peculiarities. After rain it sprouts forth new branches or sprigs, and usually remains fairly green for three years, after which it will dry up, but not die, and will still afford nourishment for camels for several years, gradually fading away, and finally dying if it does not get any rain for a period of seven years. These periods—three and seven years—are necessarily not exact in every case, but this is said to be the average. This fact, of course, accounts for pasturage being found in parts of the Sahara where it has been known not to rain for a considerable time.

The latter species, viz. the plants which only spring up annually if it rains, are known to the Arabs by the general name of “acheb.” It is said that to give life to one of these plants a heavy shower of rain at least is necessary, and that the soil must have been saturated for a depth of about four inches. The characteristic of the “acheb” is that the seed never seems to die. It merely rests in the ground, waiting for the requisite fall of rain to spring up. The locality may not have any rain for ten years, yet the seed will germinate when the rain does eventually come. “Acheb” of all kinds is eagerly devoured by camels, and most kinds of it are very nourishing.

There is a totally different sort of flora in the Sahara above and below the 20th or 21st parallel, and the difference is rather striking to the traveller, for the change of landscape and climate to which this must be due is so gradual and so slight as to be hardly noticeable.

Much of the Saharan vegetation, although so dry and unrefreshing in appearance, contains a certain amount of liquid. It is this which enables the fauna of the desert to exist without drinking.