all those Arabians who obey the Emir-al-Mumenin[268] of the sect of Ali ben Abitaleb. All the inhabitants of his country are called rebels, because they rebelled against the Emir-al-Mumenin al-Abassi who resides at Bagdad, and there is continual hatred between them. The residence of Zoan was selected for its convenience. The prince appears in public twice every year; once at the time of their great holiday, and the second time at the moment of the inundation of the Nile. Zoan is inclosed by a wall, whereas Mizraim is open, and the Nile washes one portion of it. The city is large, containing many markets and bazaars, and very wealthy Jewish inhabitants. Rain, frost, and snow are almost unknown here, the climate being very warm. The river overflows once every year, in the month of Elul[269], and, inundating the whole country, irrigates it to the extent of fifteen days' journey. The water remains standing on the land during that and the following month, whereby it is moistened and made fit for agriculture. A marble pillar, constructed with great skill, has been erected in front of an island; twelve yards of this pillar protrude above the level of the river; and whenever the water rises to a height sufficient to cover the pillar, people know that it has inundated the whole land of Egypt to the extent of fifteen days' journey, whereas if one-half only of the pillar be covered, it shows that one-half of the country is yet dry. A certain officer measures the rise of the river every day, and makes proclamation in Zoan and in Mizraim in these words: "Praise God, for the river has risen so and so much!" The measurement and the proclamation is repeated every day. Whenever the water submerges the whole pillar, it produces great plenty in the whole land of Egypt. The river rises by degrees until the whole country is inundated to the extent of fifteen days' journey. The proprietors of land cause ditches to be dug along their fields, into which the fishes are swept with the rising waters; and when the river retires into its bed, the fish remaining in the trenches are collected by the proprietors and used for food. Others sell them to merchants, by whom they are cured, and sold in this state all over the country. The fat of these fishes, with which they abound, is used by the rich of the land instead of oil, and they light their lamps therewith. Those who eat of the fish, and drink Nile water after it, need not fear any bad consequences, the water being an excellent preventive. Persons who inquire the reason of the rise of the Nile are told by the Egyptians that it is caused by the heavy rains which fall in the country of Abyssinia, the Havilah of Scripture, which is elevated above the level of Egypt. This forces the river out of its bed, and inundates the whole country. Whenever the overflowing of the Nile is suspended, they can neither sow nor reap, "and the famine is sore in the land."[270] The time for sowing in Egypt is the month of