The Horticultural Society
EVOLUTION OF MIDDLE EASTERN CIVILIZATIONS
The high antiquity of civilization in the Middle East is largely due to the existence of convenient land bridges and easy sea lanes passable in summer or winter, in dry or wet seasons. Movement of large numbers of people north of the Caspian Sea was virtually impossible in winter, owing to the severity of the climate; central Eurasia was often too dry in summer. Land passage between Asia and Africa was in early times limited to narrow strips of land in the Isthmus of Suez. Large-scale desert travel was limited to special routes in Iran and in North Africa, both east and west of the Nile Valley.
Another reason for the early significance of this area in world history is the fact that the water supply and the climate were ideal for the introduction of agriculture. Several species of grain grew wild, and there were marshes and tributary streams that could easily be drained or dammed in order to sow wild wheat and barley. The seed had only to be strewn over a sufficiently moist surface to ensure some kind of crop under normal conditions. It is therefore not surprising that there is evidence of simple agriculture as far back as the 8th or 9th millennium BC, especially in Palestine, where more excavating has been done in early sites than in any other country of the Middle East. Many bone sickle handles and flint sickle edges dating from between c. 9000 and 7000 BC have been found in Palestinian sites.
In Mesopotamia and Iran remains of this period appear in caves on the lower slopes of the Zagros Mountains between western Iran and Iraq. The date of the systematic introduction of irrigation on a large scale in Mesopotamia is somewhat doubtful because most of the early sites of irrigation culture were covered long ago by accumulation of alluvial soil brought down by the spring floods of the Tigris and Euphrates rivers. Archaeologists once thought that all irrigation originated in the foothills of the Zagros and that the earliest true farmers lived in the plains of Iran. But recent excavations and surface explorations have proved that irrigation around the upper Tigris and Euphrates, as well as their tributaries, dates from the early 6th millennium BC (e.g., at al-Kawm on the Upper Euphrates). Small-scale irrigation was practiced in Palestine (e.g., at Jericho) in the 7th millennium BC.
In northern and eastern Mesopotamia, main streams were soon partly diverted during moderate river floods into canals running more or less parallel to the rivers, which could thus be used to irrigate an extensive area. Such deflector dam irrigation avoided the self-destructive weaknesses of large storage dams, in particular the danger of depositing great masses of refractory mud in the storage basin behind the dam. In the north and east considerable urban installations developed at sites such as Nineveh no later than the 5th millennium BC, when southern Mesopotamia was still mostly swampland like the early Egyptian delta. The Euphrates had a much smaller flow of water than the nearby Tigris. The latter was much swifter, however, so that it was potentially more important for irrigation, even though much harder to tame.
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