Hastily written graffiti, in red and black ink, preserve the names of workmen, overseers, and engineers, who had laboured here at certain dates, calculations of pay or rations, diagrams of interesting details, as well as capitals and shafts of columns, which were shaped out on the spot to reduce their weight for transport. Here and there true official stelas are to be found set apart in a suitable place, recording that after a long interruption such or such an illustrious sovereign had resumed the excavations, and opened fresh chambers. Alabaster was met with not far from here in the Wady Gerrauî. The Pharaohs of very early times established a regular colony here, in the very middle of the desert, to cut the material into small blocks for transport: a strongly built dam, thrown across the valley, served to store up the winter and spring rains, and formed a pond whence the workers could always supply themselves with water. Kheops and his successors drew their alabaster from Hâtnûbû, in the neighbourhood of Hermopolis, their granite from Syene, their diorite and other hard rocks, the favourite material for their sarcophagi, from the volcanic valleys which separate the Nile from the Red Sea--especially from the Wady Hammamât. As these were the only materials of which the quantity required could not be determined in advance, and which had to be brought from a distance, every king was accustomed to send the principal persons of his court to the quarries of Upper Egypt, and the rapidity with which they brought back the stone constituted a high claim on the favour of their master. If the building was to be of brick, the bricks were made on the spot, in the plain at the foot of the hills. If it was to be a limestone structure, the neighbouring parts of the plateau furnished the rough material in abundance. For the construction of chambers and for casing walls, the rose granite of Elephantine and the limestone of Troiu were commonly employed, but they were spared the labour of procuring these specially for the occasion. The city of the White Wall had always at hand a supply of them in its stores, and they might be drawn upon freely for public buildings, and consequently for the royal tomb. The blocks chosen from this reserve, and conveyed in boats close under the mountain-side, were drawn up slightly inclined causeways by oxen to the place selected by the architect.