[Illustration: FIG. 159.--The river transport of the Mummy. (Champollion, pl. 173.)] One district of this necropolis is made up by a vast number of tombs dating from the time of the ancient empire, and particularly from the sixth dynasty. Arrangements similar to those of the mastabas at Sakkarah are found, but on a smaller scale--the same funerary chambers, the same wells, sometimes vertical, sometimes horizontal as in the tomb of Ti and the pyramids, the same materials. The situation of this tomb-district, which Mariette calls the central cemetery, has allowed arrangements to be adopted similar to those on the plateau of Memphis, where the sand is the only covering to a stratum of living rock in which it was easy to cut the well and the mummy-chamber. In the remainder of the space occupied by the tombs the subsoil is of a very different nature. "The hard and impenetrable rock is there covered with a sandstone in course of formation; this is friable at some points, at others so soft that but few mummies have been entrusted to it."[234] This formation extends over nearly the whole of the ground upon which the tombs of the eleventh, twelfth, and especially of the thirteenth, dynasties, are packed closely together. This Mariette calls the northern cemetery. The tombs of Abydos have no subterranean story, properly speaking. Well, mummy-chamber, and funerary chapel are all constructed, not dug. In the few instances in which the ground has been excavated down to the friable sandstone which over-lies the hard rock, the opening has been lined with rubble. [234] MARIETTE, _Voyage dans la Haute-Égypte_, vol. i. 1879. [Illustration: FIG. 160.--Tomb at Abydos; drawn in perspective from the elevation of Mariette.] [Illustration: FIG. 161.--Section of the above tomb.]