The Nile, then, is everything to Egypt, the condition of its existence, its father and mother, the source of the wealth by which the country has subsisted since the most remote antiquity. Now that we are about to follow Gordon along the Nile to the equator, we must not forget that we are passing through an ancient land. The first king of which there are records lived 3200 years before the Christian era, and the largest of the Great Pyramids at Ghizeh is 4600 years old (Plate XXVIII.). Its funeral crypt is cut out of the solid rock, and in it still stands the red granite sarcophagus of Cheops. Two million three hundred thousand dressed blocks, each measuring 40 cubic feet, were used in the construction of this memorial over a perishable king, and the pyramid is reckoned to be the largest edifice ever built by human hands. The buildings and works of the present time are nothing compared to it. Only the Great Wall of China can vie with it, and this is ruined and to a large extent obliterated, while the pyramid of Cheops still stands, scorched by the sun, or sharply defined in the moonlight, or dimly visible as a mysterious apparition in the dark, warm night. Twelve hundred miles south of the capital of modern Egypt the desert comes to an end, and the surface is covered by vast marshes and beds of waving reeds. This is the Sudan, "the Land of the Blacks." At the point where the White and Blue Niles mingle their waters lay the only town in the Sudan, Khartum, whither trade-routes converged from all directions, and where goods changed hands. Here were brought wares which never failed to find purchasers. The valuable feathers plucked from the swift-footed ostrich were needed to decorate the hats of European ladies; the wild elephants, larger and more powerful than their Indian congeners, were shot or caught in pitfalls in the woods for the sake of their precious ivory. But the most esteemed of all the wares that passed through Khartum were slaves--"black ivory," as they were called by their heartless Arab torturers. Elephants' tusks are heavy, and cannot be transported on horses or oxen from the depths of the forest, for draught animals are killed by the sting of the poisonous tsetse fly. Therefore the tusks had to be carried by men, and when these had finished their task they were themselves sold into Egypt, Syria, and Turkey. The forests and deserts were not inexhaustible; ivory and ostrich feathers might be worked out, but there would always be negroes. [Illustration: PLATE XXVIII. THE GREAT PYRAMIDS AT GHIZEH.]