steady water supply gives to the Nile its constant volume. At Khartum, 1,350 miles from the Mediterranean in a direct line, and 1,650 miles as the river winds, the White Nile is joined by the Blue Nile. This branch of the river drains a large part of Abyssinia, an upland and mountainous region which has a dry and a rainy season. In the dry season this stream dwindles almost to nothing; in the rainy season it is a turbid mountain torrent, which rushes impetuously onward, laden with loose soil from all the land which it drains. For this reason it is called the Blue, i. e., the Dark or Turbid, Nile.

At a distance of 140 miles north of the union of the two Niles the river receives its only other tributary, the Atbara, which also flows in from the eastern side. The Atbara, like the Blue Nile, is an insignificant stream except in the rainy season, when it is a

torrent.

It is the variation of the water supply from the Blue Nile and Atbara which causes the overflow of the river in Egypt. At the beginning of June the river begins slowly to swell; between the 15th and the 20th of July the increase becomes very rapid; toward the end of September the water ceases to rise and remains at the same height for twenty to thirty days. In October it rises again, attaining its greatest height. It then decreases, and in January, February, and March the fields gradually dry off. This overflow prepares the soil of Egypt for cultivation, first by softening it and then by fertilizing it. It was easy, under these conditions, to develop agriculture there.

Indeed, the width of productive Egypt is determined by the lateral extent of this overflow. For the last 1,500 miles of its course the Nile receives no tributary. It plows its way through regions of desert which, but for the Nile itself, are unbroken. At six points, beginning at Khartum and ending at Assuan, the river makes its way over granite ridges, through which it has never succeeded in cutting a smooth channel. These are called the Cataracts. As civilized man discovered these from the north, that at Assuan is known as the First Cataract, and that at Khartum as the Sixth. The calendar of ancient Egypt was shaped in part The year was divided into three seasons of four Beginning with the rise of the water about July 19th, there was the season of the inundation, which was followed by four months of winter and four months of summer.

by the Nile. months each.

In late geologic time all Egypt north of Cairo was a bay of the Mediterranean. In the course of the centuries the sea has been driven out by deposits of detritus brought down by the Nile. As the mud was deposited in this level region, the water continued to make its way through it here and there. Several mouths were kept open, and thus the Delta was formed. This Delta is called Lower Egypt. Upper Egypt extends from Cairo to the First Cataract; Nubia, from the First Cataract to the Sixth.

2. The Preservation of Antiquities.-Rain in Egypt is very, very rare. One might almost say that it never rains. The country lies in a latitude so far south that frost is rarely known. These two conditions have united to preserve the ruins of many ancient buildings in both Egypt and Nubia in a state of perfection which is rare in other countries. It was the custom of the ancient Egyptians to bury their dead in the dry land beyond the reach of the Nile's overflow. Like many other peoples, they placed in the tombs of their dead many objects used by the departed in life. Further, their peculiar beliefs concerning .immortality led them to mummify the bodies of the departed; i. e., they fortified them against decay. Thus archæological objects have been preserved in Egypt in an abundance and a perfection without parallel. So many of these are massive temples of stone, which, through all the ages, have stood unconcealed as silent witnesses of a past greatness, that from Cairo to the First Cataract Egypt is one great archæological museum.

3. Egyptian Discoveries. Although many Egyptian antiquities have always been visible, they attracted little attention until modern times. Egyptian temple walls are covered with hieroglyphic writing, but the art of reading it had long been lost. Coptic, a language descended from the ancient Egyptian, was still preserved as the sacred language of the Egyptian Church, as Latin is the ecclesiastical language of Roman Catholics, but no one realized that Coptic was simply late Egyptian.

In the seventeenth century European travelers began to bring home Egyptian antiquities. In 1683 a specimen of Egyptian art was presented to the Ashmolean Museum at Oxford. In the eighteenth century R. Pococke (1704-1765) and F. L. Norden (1704-1742) described a number of Egyptian ruins and identified a number of the sites mentioned by classical authors. Pococke was an Englishman and Norden a Dane. Others, like the ex

plorer Bruce, who was seeking the sources of the Nile (1768-1773), participated to some extent in the work.

No systematic examination of the antiquities was made, however, until the time of Napoleon I. When Napoleon invaded Egypt in 1798, he was accompanied by an army of eminent scholars and artists, nearly a hundred strong, and although in the settlement with England, which followed in 1802, the French were compelled to surrender their archæological treasures to Great Britain, they were permitted to publish the results of their observations and explorations. The publication of these advanced slowly, but between 1809 and 1822 the great work, consisting of one volume of introduction, three volumes of plates, and three volumes of texts, was given to the world. In these volumes the antiquities from the First Cataract to Alexandria were systematically described, and many of them were reproduced in magnificent water-color illustrations. As the nineteenth century progressed, additional discoveries were made, partly by the labors of such scientists as Lepsius and Mariette, and partly through the rifling of tombs by natives, who often sold their finds to Europeans. Since Egypt passed under English control, exploration has been fostered by the government, and English, French, German, Italian, and American explorers have taken part in it. The tombs of many of the ancient Pharaohs, the mummies of a considerable number of them, all sorts of implements and household furniture, have been discovered, as well as a great variety of historical, literary, religious, and business documents.

Within the last twenty years a series of tombs of a previously unknown type has been discovered. The bodies buried in these tombs did not lie on the back as the ordinary Egyptian mummy does, but on the side, with the knees drawn up to the chin. It was at first thought that these tombs were the work of a new race of men who had invaded Egypt at some time in the historical period, but further study indicates that they are the tombs of the early Egyptians from whom the Egyptians known to history were descended.

4. Decipherment. One of the objects found by the French at the time of Napoleon's expedition was the "Rosetta Stone," so called because found at Rosetta (Ar-Rashid), a town near the mouth of the westernmost of the large branches of the Nile. This