By the end of November the river has returned to its bed, and the fields, over which has been spread a film of rich earth, [Footnote: The rate of the fluviatile deposit is from three to five inches in a century. The surface of the valley at Thebes, as shown by the accumulations about the monuments, has been raised seven feet during the last seventeen hundred years.] present the appearance of black mud-flats. Usually the plow is run lightly over the soft surface, but in some cases the grain is sown upon the undisturbed deposit, and simply trampled in by flocks of sheep and goats driven over it. In a few weeks the entire land, so recently a flooded plain, is overspread with a sea of verdure, which forms a striking contrast to the desert sands and barren hills that rim the valley. [Illustration: ANCIENT EGYPT] CLIMATE.--In Lower Egypt, near the sea, the rainfall in the winter is abundant; but the climate of Upper Egypt is all but rainless, only a few slight showers falling throughout the year. This dryness of the Egyptian air is what has preserved through so many thousand years, in such wonderful freshness of color and with such sharpness of outline, the numerous paintings and sculptures of the monuments of the Pharaohs. The southern line of Egypt only just touches the tropics; still the climate, influenced by the wide and hot deserts that hem the valley, is semi-tropical in character. The fruits of the tropics and the cereals of the temperate zone grow luxuriantly. Thus favored in climate as well as in the matter of irrigation, Egypt became in early times the granary of the East. To it less favored countries, when stricken by famine,--a calamity so common in the East in regions dependent upon the rainfall,--looked for food, as did the families of Israel during drought and failure of crops in Palestine. DYNASTIES AND CHRONOLOGY.--The kings, or Pharaohs, that reigned in Egypt from the earliest times till the conquest of the country by Alexander the Great (332 B.C.), are grouped into thirty-one dynasties. Thirty of these we find in the lists of Manetho, an Egyptian priest who lived in the third century B.C., and who compiled a chronicle of the kings of the country from the manuscripts kept in the Egyptian temples.