The Tigris is somewhat different from its sister stream. Its name signifies "the swift," or the "arrowy," and indicates its rapid current, whereas the Euphrates flows more gently. Not so broad as the Euphrates, the Tigris is much deeper. On the east of the high mountains wherein this river has its rise, spring comes quickly; the water rises rapidly, and the period of its overflow is short. Beginning to rise in March, the first of May sees the high water mark, and by the last of June the stream is fast finding its usual volume. The territory between the Tigris and Euphrates the Greeks called Mesopotamia, meaning "between two rivers," but they applied the name to the northern portion of the district--the home of the Assyrians. As generally used today, the term Mesopotamia signifies the whole region. The southern portion, bordering on the Persian Gulf, has a deep alluvial soil, built up by the yearly deposit of the rivers. Like the valley of the Nile, it has been the repository of fine silt. This portion from its capital city Babylon was called Babylonia. As we might expect, this was the country first settled because it was the more accessible. Its wide, monotonous plains, enriched with the fertile mountain loam, afforded the most productive farm lands in the world. Herodotus told of their prodigious yield of grain: "This territory is of all that we know the best by far for producing grain; as to trees, it does not attempt to bear them, either fig, or vine or olive, but for producing grain it is so good that it returns as much as two-hundred-fold for the average, and, when it bears its best, it produces three-hundred-fold. The blades of the wheat and barley there grew to be four fingers broad; and from millet and sesame seed, how large a tree grows, I know myself, but shall not record, being well aware that even what has already been said relating to the crops produced has been enough to cause disbelief in those who have not visited Babylonia." Theophrastus wrote: "In Babylon the wheat fields are regularly mown twice, and then fed off with beasts to keep down the luxuriance of the leaf; otherwise the plant does not run to ear. When this is done the return in lands that are badly cultivated is fiftyfold, while in those that are well farmed it is a hundredfold."