The great pyramid of Cheops, though commenced in 3733 B.C., is not the oldest monument in Egypt; the step pyramid of Sakkara is of earlier date, while the origin of the sphinx is lost in obscurity. The pyramid, however, is of immense size, and leaves an abiding impression upon the minds of everyone who has seen it, or climbed its rugged sides. Figures convey little, I am afraid, but when I tell you that each of its sides was originally 755 feet in length and its height 481 feet, or 60 feet higher than the cross of St. Paul's, and that gangs of men, 100,000 in each, were engaged for twenty years in its construction, some idea of its immensity may be formed. At one time the pyramids were covered with polished stone, but this has all been removed and has been used in building the mosques of Cairo, and to-day its exterior is a series of steps, each 4 to 6 feet in height, formed by the enormous blocks of limestone of which it is built. Designed as a tomb, it has various interior chambers and passages, but it was long ago ransacked by the Persians, and later by the Romans and Arabs, so that of whatever treasure it may once have contained, nothing now remains but the huge stone sarcophagus or coffin of the King. The second pyramid, built by Chephron 3666 B.C., is little less in size, and still has a little of the outer covering at its apex. All around these two great pyramids are grouped a number of others, while the rock is honeycombed with tombs, and practically from here to the first cataract the belt of rocky hills which rise so abruptly from the Nile Valley is one continuous cemetery, only a small portion of which has so far been explored. Close by is the sphinx, the oldest of known monuments. Hewn out of the solid rock, its enormous head and shoulders rise above the sand which periodically buries it, and, battered though it has been by Mohammed Ali's artillery, the expression of its face, as it gazes across the fertile plain towards the sunrise, is one of calm inscrutability, difficult to describe, but which fascinates the beholder. From the plateau on which these pyramids are built may be seen successively the pyramids of Abousīr, Sakkara, and Darshūr, and far in the distance the curious and lonely pyramid of Medūn. These are all built on the edge of the desert, which impinges on the cultivated land so abruptly that it is almost possible to stand with one foot in the desert and the other in the fields. In addition to the pyramids, Sakkara has many tombs of the greatest interest, two of which I will describe. One is called the "Serapeum," or tomb of the bulls. Here, each in its huge granite coffin, the mummies of the sacred bulls, for so long worshipped at Memphis, have been buried.