In the central part of the Algerian Sahara, the Arbâa[23] affect the offspring of _Rakeby_. This breed has both height and bottom, and is found among the Aghrazelias, the Oulad-Shayb, the Oulad-Mokhtar, and even among the Oulad-Khrelif.[24] For the most part they are gray or dark bay. They endure hunger and thirst with ease, and without being knocked up will cover for several consecutive days distances of twenty-five to thirty leagues.[25] At the present day the finest animals are in the family of the Seuffrân. _Rakeby_, it seems, was formerly brought from Morocco by the ancestors of Sidi-Hamed-Oulad-_Tedjini_, the famous Marabout of Aain-Mady. The Oulad-Nayl[26] make use of the offspring of a celebrated stallion named El-Biod, "the White," formerly the property of the Oulad-Si-Mahmed, one of their divisions. This stock is renowned for its sobriety and speed. In the Hodna and the Medjana, among the Oulad-Makrane and the Ghiras, the most highly esteemed are the descendants of a well-known stallion belonging to the Oulad-Mahdi. It was named Bey-el-Hissen, and was the property of the family of El-Amri-ben-Abi-Meramer. A good horse in the desert ought to accomplish for five or six days, one after the other, distances of twenty-five to thirty leagues. After a couple of day's rest, if well fed, he will be quite fresh enough to repeat the feat. "With a horse that on arriving at a resting place shakes himself, paws the ground with his foot, and neighs at the approach of the barley, then pushing his head into the nosebag begins to munch eagerly three or four mouthfuls of the grain, there is no occasion to pull up in a journey." The distances to be traversed in the Sahara are not always of such great length, but at the same time it is no very rare occurrence to hear of horses doing fifty to sixty leagues in four and twenty hours.