the same ethnological tree. This is however quite a recent idea, and at best but a mere hypothesis.20 Algeria presents a vast field for research, and it is easy to find dolmens and cromlechs, such as that shown in Fig. 64, which are sepulchres with a central dolmen surrounded by a double or triple enceinte of monoliths driven into the ground. These monuments, much as they differ in form and arrangement, are undoubtedly the work of one strong and powerful race that dominated the whole of the north of Africa; and are represented in historic times by the Berbers, and at the present clay by the Kabyles. [Illustration: 64.] Cromlech near Bône (Algeria). Although a very great many of them have been destroyed, the French possessions in Algeria are still as rich in monuments of this kind as any of the countries of Europe. On Mount Redgel-Safia six hundred dolmens have been made out, with stone tables resting on walls of dry stones and frequently surrounded by cromlechs. Dr. Weisgerber has recently announced the discovery in the valley of Ain-Massin, on the vest of Mzab,) of a cromlech consisting of a number of concentric circles of large stones set upon an elliptical tumulus, more than fifty-four square yards in area. Quite close is a workshop of flint weapons, probably in use at the time of the erection of the megaliths.21 In Midjana, the number of megaliths exceeds 10,000, and General Faidherbe counted more than 2,000 in the necropolis of Mazela, and a yet larger number in that of Roknia. “At Bou-Merzoug,” says M. Feraud,22 “in a radius of three leagues, on the mountain as well as on the plain, the whole country about the springs is covered with monuments of the Celtic form, such as dolmens, demi-dolmens, menhirs, avenues, and tumuli. In a word, there are to be found examples of nearly every type known in Europe. For fear of being taxed with exaggeration, I will not fix the number, but I can certify that I saw and examined more than a thousand in the three days of exploration, on the mountain itself, and on the declivities wherever it was possible to place them. All the monuments are surrounded with a more or less complete enceinte of large stones, sometimes set up in a circle, sometimes in a square. In some cases the living rock forms hart of the enceinte, which has been completed with the help of other blocks frolic elsewhere. It is often difficult to decide where the monument end, and the rock begins. When the escarpment was too abrupt, it was levelled with the aid of a kind of retaining wall, which forms a terrace round the dolmen. The dolmens in the plain seem to have been constructed with even greater care. The enceintes are wider and the slabs of the tables larger.” Megalithic monuments are met with even in the desert. A pyramid built of stones without mortar rises up in the districts inhabited by the Touaregs; and quite near to it are four or five tombs surrounded by standing stones.