[25] LAYARD, _Nineveh and its Remains_, vol. i. p. 78 (1849). "Flowers of every hue enamelled the meadows; not thinly scattered over the grass as in northern climes, but in such thick and gathering clusters that the whole plain seemed a patch-work of many colours. The dogs as they returned from hunting, issued from the long grass dyed red, yellow, or blue, according to the flowers through which they had last forced their way." [26] LAYARD, _Nineveh and its Remains_, vol. ii. pp. 68-75. [27] HERODOTUS, i. 193. "Of all the countries that we know, there is none which is so fruitful in grain. It makes no pretension indeed, of growing the fig, the olive, the vine, or any other trees of the kind; but in grain it is so fruitful as to yield commonly two hundredfold, and when the production is greatest, even three hundredfold. The blade of the wheat plant and barley is often four fingers in breadth. As for millet and the sesame, I shall not say to what height they grow, though within my own knowledge; for I am not ignorant that what I have already written concerning the fruitfulness of Babylonia, must seem incredible to those who have never visited the country.... Palm trees grow in great numbers over the whole of the flat country, mostly of the kind that bears fruit, and this fruit supplies them with bread, wine, and honey." Sec. 3.--_The Primitive Elements of the Population._ The two great factors of all life and of all vegetable production are water and warmth, so that of the two great divisions of the country we have just described, the more southern must have been the first inhabited, or at least, the first to invite and aid its inhabitants to make trial of civilization. In the north the two great rivers are far apart. The vast spaces which separate them include many districts which have always been, and must ever be, very difficult of irrigation, and consequently of cultivation. In the south, on the other hand, below the thirty-fourth degree of latitude, the Tigris and Euphrates approach each other until a day's march will carry the traveller from one to the other; and for a distance of some eighty leagues, ending but little short of the point of junction, their beds are almost parallel. In spite of the heat, which is, of course, greater than in northern Mesopotamia, nothing is easier than to carry the blessings of irrigation over the whole of such a region. When the water in the rivers and canals is low, it can be raised by the aid of simple machines, similar in principle to those we described in speaking of Egypt.[28]