1 Facsimile of the map published by Kircher in OEdipus
Ægyptiacus, vol. i. (Iconismus II), p. 53.
Many of the legends relating to this subject are lost, while others have been collected and embellished with fresh features by Jewish and Christian theologians. The Nile was said to have its source in Paradise, to traverse burning regions inaccessible to man, and afterwards to fall into a sea whence it made its way to Egypt. Sometimes it carried down from its celestial sources branches and fruits unlike any to be found on earth. The sea mentioned in all these tales is perhaps a less extravagant invention than we are at first inclined to think. A lake, nearly as large as the Victoria Nyanza, once covered the marshy plain where the Bahr el-Abiad unites with the Sobat, and with the Bahr el-Ghazal. Alluvial deposits have filled up all but its deepest depression, which is known as Birket Nû; but, in ages preceding our era, it must still have been vast enough to suggest to Egyptian soldiers and boatmen the idea of an actual sea, opening into the Indian Ocean. The mountains, whose outline was vaguely seen far to southward on the further shores, doubtless contained within them its mysterious source. There the inundation was made ready, and there it began upon a fixed day. The celestial Nile had its periodic rise and fall, on which those of the earthly Nile depended. Every year, towards the middle of June, Isis, mourning for Osiris, let fall into it one of the tears which she shed over her brother, and thereupon the river swelled and descended upon earth. Isis has had no devotees for centuries, and her very name is unknown to the descendants of her worshippers; but the tradition of her fertilizing tears has survived her memory. Even to this day, every one in Egypt, Mussulman or Christian, knows that a divine drop falls from heaven during the night between the 17th and 18th of June, and forthwith brings about the rise of the Nile. Swollen by the rains which fall in February over the region of the Great Lakes, the White Nile rushes northward, sweeping before it the stagnant sheets of water left by the inundation of the previous year. On the left, the Bahr el-Ghazâl brings it the overflow of the ill-defined basin stretching between Darfûr and the Congo; and the Sobat pours in on the right a tribute from the rivers which furrow the southern slopes of the Abyssinian mountains. The first swell passes Khartum by the end of April, and raises the water-level there by about a foot, then it slowly makes its way through Nubia, and dies away in Egypt at the beginning of June. Its waters, infected by half-putrid organic matter from the equatorial swamps, are not completely freed from it even in the course of this long journey, but keep a greenish tint as far as the Delta. They are said to be poisonous, and to give severe pains in the bladder to any who may drink them. I am bound to say that every June, for five years, I drank this green water from the Nile itself, without taking any other precaution than the usual one of filtering it through a porous jar. Neither I, nor the many people living with me, ever felt the slightest inconvenience from it. Happily, this Green Nile does not last long, but generally flows away in three or four days, and is only the forerunner of the real flood. The melting of the snows and the excessive spring rains having suddenly swollen the torrents which rise in the central plateau of Abyssinia, the Blue Nile, into which they flow, rolls so impetuously towards the plain that, when its waters reach Khartum in the middle of May, they refuse to mingle with those of the White Nile, and do not lose their peculiar colour before reaching the neighbourhood of Abu Hamed, three hundred miles below. From that time the height of the Nile increases rapidly day by day. The river, constantly reinforced by floods following one upon another from the Great Lakes and from Abyssinia, rises in furious bounds, and would become a devastating torrent were its rage not checked by the Nubian cataracts. Here six basins, one above another, in which the water collects, check its course, and permit it to flow thence only as a partially filtered and moderated stream. It is signalled at Syene towards the 8th of June, at Cairo by the 17th to the 20th, and there its birth is officially celebrated during the "Night of the Drop." Two days later it reaches the Delta, just in time to save the country from drought and sterility. Egypt, burnt up by the Khamsin, a west wind blowing continuously for fifty days, seems nothing more than an extension of the desert. The trees are covered and choked by a layer of grey dust. About the villages, meagre and laboriously watered patches of vegetables struggle for life, while some show of green still lingers along the canals and in hollows whence all moisture has not yet evaporated. The plain lies panting in the sun—naked, dusty, and ashen—scored with intersecting cracks as far as eye can see. The Nile is only half its usual width, and holds not more than a twentieth of the volume of water which is borne down in October. It has at first hard work to recover its former bed, and attains it by such subtle gradations that the rise is scarcely noted. It is, however, continually gaining ground; here a sandbank is covered, there an empty channel is filled, islets are outlined where there was a continuous beach, a new stream detaches itself and gains the old shore. The first contact is disastrous to the banks; their steep sides, disintegrated and cracked by the heat, no longer offer any resistance to the current, and fall with a crash, in lengths of a hundred yards and more.
As the successive floods grow stronger and are more heavily charged with mud, the whole mass of water becomes turbid and changes colour. In eight or ten days it has turned from greyish blue to dark red, occasionally of so intense a colour as to look like newly shed blood. The "Red Nile" is not unwholesome like the "Green Nile," and the suspended mud to which it owes its suspicious appearance deprives the water of none of its freshness and lightness. It reaches its full height towards the 15th of July; but the dykes which confine it, and the barriers constructed across the mouths of canals, still prevent it from overflowing. The Nile must be considered high enough to submerge the land adequately before it is set free. The ancient Egyptians measured its height by cubits of twenty-one and a quarter inches. At fourteen cubits, they pronounced it an excellent Nile; below thirteen, or above fifteen, it was accounted insufficient or excessive, and in either case meant famine, and perhaps pestilence at hand. To this day the natives watch its advance with the same anxious eagerness; and from the 3rd of July, public criers, walking the streets of Cairo, announce each morning what progress it has made since evening. More or less authentic traditions assert that the prelude to the opening of the canals, in the time of the Pharaohs, was the solemn casting to the waters of a young girl decked as for her bridal—the "Bride of the Nile." Even after the Arab conquest, the irruption of the river into the bosom of the land was still considered as an actual marriage; the contract was drawn up by a cadi, and witnesses confirmed its consummation with the most fantastic formalities of Oriental ceremonial. It is generally between the 1st and 16th of July that it is decided to break through the dykes. When that proceeding has been solemnly accomplished in state, the flood still takes several days to fill the canals, and afterwards spreads over the low lands, advancing little by little to the very edge of the desert. Egypt is then one sheet of turbid water spreading between two lines of rock and sand, flecked with green and black spots where there are towns or where the ground rises, and divided into irregular compartments by raised roads connecting the villages. In Nubia the river attains its greatest height towards the end of August; at Cairo and in the Delta not until three weeks or a month later. For about eight days it remains stationary, and then begins to fall imperceptibly. Sometimes there is a new freshet in October, and the river again increases in height. But the rise is unsustained; once more it falls as rapidly as it rose, and by December the river has completely retired to the limits of its bed. One after another, the streams which fed it fail or dwindle. The Tacazze is lost among the sands before rejoining it, and the Blue Nile, well-nigh deprived of tributaries, is but scantily maintained by Abyssinian snows. The White Nile is indebted to the Great Lakes for the greater persistence of its waters, which feed the river as far as the Mediterranean, and save the valley from utter drought in winter. But, even with this resource, the level of the water falls daily, and its volume is diminished. Long-hidden sandbanks reappear, and are again linked into continuous line. Islands expand by the rise of shingly beaches, which gradually reconnect them with each other and with the shore. Smaller branches of the river cease to flow, and form a mere network of stagnant pools and muddy ponds, which fast dry up. The main channel itself is only intermittently navigable; after March boats run aground in it, and are forced to await the return of the inundation for their release. From the middle of April to the middle of June, Egypt is only half alive, awaiting the new Nile.
Those ruddy and heavily charged waters, rising and retiring with almost mathematical regularity, bring and leave the spoils of the countries they have traversed: sand from Nubia, whitish clay from the regions of the Lakes, ferruginous mud, and the various rock-formations of Abyssinia. These materials are not uniformly disseminated in the deposits; their precipitation being regulated both by their specific gravity and the velocity of the current. Flattened stones and rounded pebbles are left behind at the cataract between Syene and Keneh, while coarser particles of sand are suspended in the undercurrents and serve to raise the bed of the river, or are carried out to sea and form the sandbanks which are slowly rising at the Damietta and Rosetta mouths of the Nile. The mud and finer particles rise towards the surface, and are deposited upon the land after the opening of the dykes. Soil which is entirely dependent on the deposit of a river, and periodically invaded by it, necessarily maintains but a scanty flora; and though it is well known that, as a general rule, a flora is rich in proportion to its distance from the poles and its approach to the equator, it is also admitted that Egypt offers an exception to this rule. At the most, she has not more than a thousand species, while, with equal area, England, for instance, possesses more than fifteen hundred; and of this thousand, the greater number are not indigenous. Many of them have been brought From Central Africa by the river: birds and winds have continued the work, and man himself has contributed his part in making it more complete. From Asia he has at different times brought wheat barley the olive, the apple, the white or pink almond, and some twenty other species now acclimatized on the banks of the Nile. Marsh plants predominate in the Delta; but the papyrus, and the three varieties of blue, white, and pink lotus which once flourished there, being no longer cultivated, have now almost entirely disappeared, and reverted to their original habitats.
