204 A History of Art in Ancient Egypt. the first six dynasties so unequal in height and appearance, the very unequal length of the reigns is the most important. If we were better acquainted with the condition of Egypt in those remote epochs, we should, no doubt, be enabled to give other reasons for their want of uniformity. The chances of completion and even of preservation in its complete state enjoyed by a pyramid must have greatly depended upon the descent of the crown. Wlien king succeeded king in one family those chances were much better than when dynasty succeeded dynasty, whether the break were due to internal revolution or to the failure of the legitimate line. It is even possible that some of those pyramids which are now to outward appearance mere heaps of debris never received the mimimy for whose reception they were designed and built. The pyramids differ also in the materials employed. The great pyramids at Gizeh are built of fine limestone from Mokattam and Toura ; the chief one at Sakkarah of a bad clavish limestone from the neighbouring rocks ; at Dashour and Abou-Roash there are pyramids of unburnt brick. Finally there are pyramids built chiefly of stone which is kept in place by a carefully constructed skeleton, so to speak, of brick. This construction is to be found in the pyramid of Illahoun, at the entrance to the Fayoum (Fig. 131). There is the same variety in the position of the mummy chamber. Sometimes this is within the sides of the pyramid itself, as in that of Cheops ; sometimes, after the example of the mastaba, it is cut out of the living rock upon which the pyramid stands. This arrangement is to be found, for instance, in the pyramid of Mycerinus, where the roof of the mummy chamber is about ^i^^i feet below the lowest course of the pyramid itself. So too in the Stepped Pyramid, where the whole complicated system of corridors and cells, which distinguishes that edifice, is cut in the rock, so that the building itself is absolutely solid. Most of the pyramids have no more than one or two entrances, giving access to narrow galleries, sometimes ascending, sometimes descending, which lead to one or two chambers of very small dimensions when compared to the enormous mass which rises above and around them (Fig. 132). In the subterranean part of the Stepped Pyramid the proportion of voids to solids is far less insignificant. This pyramid, which is not nearly so carefully oriented as the others.
