Such, then, are the accounts of Eratosthenes and Aristobulus.
13. But Polycleitus says, that the Euphrates does not overflow its banks, because its course is through large plains; that of the mountains (from which it is supplied), some are distant 2000, and the Cossæan mountains scarcely 1000 stadia, that they are not very high, nor covered with snow to a great depth, and therefore do not occasion the snow to melt in great masses, for the most elevated mountains are in the northern parts above Ecbatana; towards the south they are divided, spread out, and are much lower; the Tigris also receives the greater part of the water [which comes down from them], and thus overflows its banks.[500]
The last assertion is evidently absurd, because the Tigris descends into the same plains (as the Euphrates); and the above-mentioned mountains are not of the same height, the northern being more elevated, the southern extending in breadth, but are of a lower altitude. The quantity of snow is not, however, to be estimated by altitude only, but by aspect. The same mountain has more snow on the northern than on the southern side, and the snow continues longer on the former than on the latter. As the Tigris therefore receives from the most southern parts of Armenia, which are near Babylon, the water of the melted snow, of which there is no great quantity, since it comes from the southern side, it should overflow in a less degree than the Euphrates, which receives the water from both parts (northern and southern); and not from a single mountain only, but from many, as I have mentioned in the description of Armenia. To this we must add the length of the river, the large tract of country which it traverses in the Greater and in the Lesser Armenia, the large space it takes in its course in passing out of the Lesser Armenia and Cappadocia, after issuing out of the Taurus in its way to Thapsacus (forming the boundary between Syria below and Mesopotamia), and the large remaining portion of country as far as Babylon and to its mouth, a course in all of 36,000 stadia.
This, then, on the subject of the canals (of Babylonia).
14. Babylonia produces barley in larger quantity than any other[501] country, for a produce of three hundred-fold is spoken of. The palm tree furnishes everything else, bread, wine, vinegar, and meal; all kinds of woven articles are also procured from it. Braziers use the stones of the fruit instead of charcoal. When softened by being soaked in water, they are food for fattening oxen and sheep.
It is said that there is a Persian song in which are reckoned up 360 useful properties of the palm.
They employ for the most part the oil of sesamum, a plant which is rare in other places.
15. Asphaltus is found in great abundance in Babylonia. Eratosthenes describes it as follows.
The liquid asphaltus, which is called naphtha, is found in Susiana; the dry kind, which can be made solid, in Babylonia. There is a spring of it near the Euphrates. When this river overflows at the time of the melting of the snow, the spring also of asphaltus is filled, and overflows into the river, where large clods are consolidated, fit for buildings constructed of baked bricks. Others say that the liquid kind also is found in Babylonia. With respect to the solid kind, I have described its great utility in the construction of buildings. They say that boats (of reeds) are woven,[502] which, when besmeared with asphaltus, are firmly compacted. The liquid kind, called naphtha, is of a singular nature. When it is brought near the fire, the fire catches it; and if a body smeared over with it is brought near the fire, it burns with a flame, which it is impossible to extinguish, except with a large quantity of water; with a small quantity it burns more violently, but it may be smothered and extinguished by mud, vinegar, alum, and glue. It is said that Alexander, as an experiment, ordered naphtha to be poured over a boy in a bath, and a lamp to be brought near his body. The boy became enveloped in flames, and would have perished if the bystanders had not mastered the fire by pouring upon him a great quantity of water, and thus saved his life.