(M25) If the Egyptian farmer of the olden time could thus get no help, except at the rarest intervals, from the official or sacerdotal calendar, he must have been compelled to observe for himself those natural signals which marked the times for the various operations of husbandry. In all ages of which we possess any records the Egyptians have been an agricultural people, dependent for their subsistence on the growth of the corn. The cereals which they cultivated were wheat, barley, and apparently sorghum (_Holcus sorghum_, Linnaeus), the _doora_ of the modern fellaheen.(57) Then as now the whole country, with the exception of a fringe on the coast of the Mediterranean, was almost rainless, and owed its immense fertility entirely to the annual inundation of the Nile, which, regulated by an elaborate system of dams and canals, was distributed over the fields, renewing the soil year by year with a fresh deposit of mud washed down from the great equatorial lakes and the mountains of Abyssinia. Hence the rise of the river has always been watched by the inhabitants with the utmost anxiety; for if it either falls short of or exceeds a certain height, dearth and famine are the inevitable consequences.(58) The water begins to rise early in June, but it is not until the latter half of July that it swells to a mighty tide. By the end of September the inundation is at its greatest height. The country is now submerged, and presents the appearance of a sea of turbid water, from which the towns and villages, built on higher ground, rise like islands. For about a month the flood remains nearly stationary, then sinks more and more rapidly, till by December or January the river has returned to its ordinary bed. With the approach of summer the level of the water continues to fall. In the early days of June the Nile is reduced to half its ordinary breadth; and Egypt, scorched by the sun, blasted by the wind that has blown from the Sahara for many days, seems a mere continuation of the desert. The trees are choked with a thick layer of grey dust. A few meagre patches of vegetables, watered with difficulty, struggle painfully for existence in the immediate neighbourhood of the villages. Some appearance of verdure lingers beside the canals and in the hollows from which the moisture has not wholly evaporated. The plain appears to pant in the pitiless sunshine, bare, dusty, ash-coloured, cracked and seamed as far as the eye can see with a network of fissures. From the middle of April till the middle of June the land of Egypt is but half alive, waiting for the new Nile.(59)