The tombs are always turned towards the west, and are deeply hollowed out in soil, or hewn in the rocks of the Libyan mountains. Those of the wealthier sort generally consist of two chambers, an upper and a lower, or a front and a back one. The upper or front chamber is furnished with a description of the life of the dead person, his possessions, his office, his occupation, and the most important results of his life exhibited in relief and pictures. It served as a chapel in which the offerings to the dead were made. In the lower or hinder chamber lay the corpse. The corpses of the poorer inhabitants found their resting-place in the common sepulchres. The preservation of the corpse was accomplished in various ways. Either the entrails were taken out through an aperture and placed in separate vessels, or the corpse was protected against corruption by the injection of various substances; or finally it was allowed to lie for a considerable time in saltpetre. Like the embalmment and the tomb, the cerements and the coffin were more or less costly, according to the rank and wealth of the deceased. The dead person was placed in a receptacle adapted to the shape of the corpse, provided with a mask to represent his face, and adorned with inscriptions and pictures. On the breast was generally depicted the beetle of Ptah, or an open eye, the symbol of Osiris. This receptacle was then placed in two or more coffins, each inclosing the other, which were made of more or less costly wood. Rich persons added to their coffins the stone sarcophagus, a hollow block of granite, the heavy lid of which was then made so fast to the lower part that it could not be opened without destroying the whole.