As soon as the water of the Nile retires, the ground is sown without previous preparation, and the grain, falling straight into the mud, grows as vigorously as in the best-ploughed furrows. Where the earth is hard it is necessary to break it up, but the extreme simplicity of the instruments with which this was done shows what a feeble resistance it offered. For a long time the hoe sufficed. It was composed either of a large stone tied to a wooden handle, or was made of two pieces of wood of unequal length, united at one of their extremities, and held together towards the middle by a slack cord: the plough, when first invented was but a slightly enlarged hoe, drawn by oxen. The cultivation of cereals, once established on the banks of the Nile, developed, from earliest times, to such a degree as to supplant all else: hunting, fishing, the rearing of cattle, occupied but a secondary place compared with agriculture, and Egypt became, that which she still remains, a vast granary of wheat. The part of the valley first cultivated was from Gebel Silsileh to the apex of the Delta.[*] * This was the tradition of all the ancients. Herodotus related that, according to the Egyptians, the whole of Egypt, with the exception of the Theban nome, was a vast swamp previous to the time of Menes. Aristotle adds that the Red Sea, the Mediterranean, and the area now occupied by the Delta, formed one sea. Cf. pp. 3-5 of this volume, on the formation of the Delta. [Illustration: 087.jpg PLOUGHING. 2] 2 Bas-relief from the tomb of Ti; drawn by Faucher-Gudin, from a photograph by Emil Brugsch-Bey. Between the Libyan and Arabian ranges it presents a slightly convex surface, furrowed lengthways by a depression, in the bottom of which the Nile is gathered and enclosed when the inundation is over. In the summer, as soon as the river had risen higher than the top of its banks, the water rushed by the force of gravity towards the lower lands, hollowing in its course long channels, some of which never completely dried up, even when the Nile reached its lowest level.[*] Cultivation was easy in the neighbourhood of these natural reservoirs, but everywhere else the movements of the river were rather injurious than advantageous to man. The inundation scarcely ever covered the higher ground in the valley, which therefore remained unproductive; it flowed rapidly over the lands of medium elevation, and moved so sluggishly in the hollows that they became weedy and stagnant pools.[**] * The whole description of the damage which can be done by the Nile in places where the inundation is not regulated, is borrowed from Linant de Bellefonds, _Memoire sur les principaux travaux d'utilite publique_, p. 3. ** This physical configuration of the country explains the existence at a very early date of those gigantic serpents which I have already mentioned.