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is one that may be justly maintained, in view of the different character that the southern valley presents from the northern plain, it has become so customary, in popular parlance, to think of the entire territory along and between the Euphrates and Tigris as one country, that the term Mesopotamia in this broad sense may be retained, with the division suggested by George Rawlinson, into Upper and Lower Mesopotamia. The two streams, as they form the salient traits of the region, are the factors that condition the character of the inhabitants and the culture that once flourished there. The Euphrates, or, to give the more correct pronunciation, Purat, signifies the 'river' par excellence. It is a quiet stream, flowing along in majestic dignity almost from its two sources, in the Armenian mountains, not far from the town of Erzerum, until it is joined by the Tigris in the extreme south. As the Shatt-el Arab, i.e., Arabic River, the two reach the Persian Gulf. Receiving many tributaries as long as it remains in the mountains, it flows first in a westerly direction, as though making direct for the Mediterranean Sea, then, veering suddenly to the southeast, it receives but few tributaries after it once passes through the Taurus range into the plain—on the right side, only the Sadschur, on the left the Balichus and the Khabur. From this point on for the remaining distance of 800 miles, so far from receiving fresh accessions, it loses in quantity through the marsh beds that form on both sides. When it reaches the alluvial soil of Babylonia proper, its current and also its depth are considerably diminished through the numerous canals that form an outlet for its waters. Of its entire length, 1780 miles, it is navigable only for a small distance, cataracts forming a hindrance in its northern course and sandbanks in the south. In consequence, it never became at any time an important avenue for commerce, and besides rafts, which could be floated down to a certain distance, the only means of communication ever used were wicker baskets coated within and without with bitumen, or some form of a primitive ferry for passing from one shore to another.

      An entirely different stream is the Tigris—a corrupted form of 'Idiklat.' It is only 1146 miles in length, and is marked, as the native name indicates, by the 'swiftness' of its flow. Starting, like the Euphrates, in the rugged regions of Armenia, it continues its course through mountain clefts for a longer period, and joined at frequent intervals by tributaries, both before it merges into the plain and after doing so, the volume of its waters is steadily increased. Even when it approaches the alluvial soil of the south, it does not lose its character until well advanced in its course to the gulf. Advancing towards the Euphrates and again receding from it, it at last joins the latter at Korna, and together they pour their waters through the Persian Gulf into the great ocean. It is navigable from Diabekr in the north, for its entire length. Large rafts may be floated down from Mosul to Baghdad and Basra, and even small steamers have ascended as far north as Nimrud. The Tigris, then, in contrast to the Euphrates, is the avenue of commerce for Mesopotamia, forming the connecting bond between it and the rest of the ancient world—Egypt, India, and the lands of the Mediterranean. Owing, however, to the imperfect character of the means of transportation in ancient and, for that matter, in modern times, the voyage up the stream was impracticable. The rafts, resting on inflated bags of goat or sheep skin, can make no headway against the rapid stream, and so, upon reaching Baghdad or Basra, they are broken up, and the bags sent back by the shore route to the north.

      The contrast presented by the two rivers is paralleled by the traits distinguishing Upper from Lower Mesopotamia. Shut off to the north and northeast by the Armenian range, to the northwest by the Taurus, Upper Mesopotamia retains, for a considerable extent, and especially on the eastern side, a rugged aspect. The Kurdish mountains run close to the Tigris' bed for some distance below Mosul, while between the Tigris and the Euphrates proper, small ranges and promontories stretch as far as the end of the Taurus chain, well on towards Mosul.

      Below Mosul, the region begins to change its character. The mountains cease, the plain begins, the soil becomes alluvial and through the regular overflow of the two rivers in the rainy season, develops an astounding fertility. This overflow begins, in the case of the Tigris, early in March, reaches its height in May, and ceases about the middle of June. The overflow of the Euphrates extends from the middle of March till the beginning of June, but September is reached before the river resumes its natural state. Not only does the overflow of the Euphrates thus extend over a longer period, but it oversteps its banks with greater violence than does the Tigris, so that as far north as the juncture with the Khabur, and still more so in the south, the country to both sides is flooded, until it assumes the appearance of a great sea. Through the violence of these overflows, changes constantly occur in the course that the river takes, so that places which in ancient times stood on its banks are to-day removed from the main river-bed. Another important change in Southern Babylonia is the constant accretion of soil, due to the deposits from the Persian Gulf.

      This increase proceeding on an average of about one mile in fifty years has brought it about that the two rivers to-day, instead of passing separately into the Gulf, unite at Korna—some distance still from the entrance. The contrast of seasons is greater, as may be imagined, in Upper Mesopotamia than in the south. The winters are cold, with snowfalls that may last for several months, but with the beginning of the dry season, in May, a tropical heat sets in which lasts until the beginning of November, when the rain begins. Assyria proper, that is, the eastern side of Mesopotamia, is more affected by the mountain ranges than the west. In the Euphrates Valley, the heat during the dry season, from about May till November, when for weeks, and even months, no cloud is to be seen, beggars description; but strange enough, the Arabs who dwell there at present, while enduring the heat without much discomfort, are severely affected by a winter temperature that for Europeans and Americans is exhilarating in its influence.

      From what has been said, it will be clear that the Euphrates is, par excellence, the river of Southern Mesopotamia or Babylonia, while the Tigris may be regarded as the river of Assyria. It was the Euphrates that made possible the high degree of culture, that was reached in the south. Through the very intense heat of the dry season, the soil developed a fertility that reduced human labor to a minimum. The return for sowing of all kinds of grain, notably wheat, corn, barley, is calculated, on an average, to be fifty to a hundred-fold, while the date palm flourishes with scarcely any cultivation at all. Sustenance being thus provided for with little effort, it needed only a certain care in protecting oneself from damage through the too abundant overflow, to enable the population to find that ease of existence, which is an indispensable condition of culture. This was accomplished by the erection of dikes, and by directing the waters through channels into the fields.

      Assyria, more rugged in character, did not enjoy the same advantages. Its culture, therefore, not only arose at a later period than that of Babylonia, but was a direct importation from the south. It was due to the natural extension of the civilization that continued for the greater part of the existence of the two empires to be central in the south. But when once Assyria was included in the circle of Babylonian culture, the greater effort required in forcing the natural resources of the soil, produced a greater variety in the return. Besides corn, wheat and rice, the olive, banana and fig tree, mulberry and vine were cultivated, while the vicinity of the mountain ranges furnished an abundance of building material—wood and limestone—that was lacking in the south. The fertility of Assyria proper, again, not being dependent on the overflow of the Tigris, proved to be of greater endurance. With the neglect of the irrigation system, Babylonia became a mere waste, and the same river that was the cause of its prosperity became the foe that, more effectually than any human power, contributed to the ruin and the general desolation that marks the greater part of the Euphrates Valley at the present time. Assyria continued to play a part in history long after its ancient glory had departed, and to this day enjoys a far greater activity, and is of considerable more significance than the south.

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