He no longer lived in caves or rude huts, but in a low, flat-roofed house built of heavy, rough stone, and, later, of stones hewn into shape or of bricks baked in the burning sunshine. Stone and clay carved or molded into images, and the colored earth, smeared into designs upon his walls, gave him the beginnings of art. And from drawing rude pictures of simple objects, as a child begins to draw even before knowing what it means to write, primitive man came at last to the greatest power of all—the art of writing. Through all this age man continued to regulate his expanding affairs by the timepieces of the sky—the sun, the moon, and the stars. He divided time roughly into days and parts of days, into nights and watches of the night, into moons and seasons—determining the latter probably by the migration of birds, the budding of trees and flowers, the falling of leaves and other happenings in nature. But never guessing how greatly interested future generations would be in the way he did things, he has left only a few records of his activities and these have been preserved by the merest accident. The historian and the press-agent were the inventions of later days. Thus we come down the ages to a date about 4000 B. C. at the very beginning of recorded history, and to one of the most ancient civilizations in the world—that of the region which we now call Mesopotamia. Mesopotamia lies in southwestern Asia between the Tigris and Euphrates Rivers and not far from the traditional site of the Garden of Eden. The name by which we know it comes from the Greek, and means, "The land between the rivers" but the people who dwelt there at the time to which we refer called it the "Land of Shinar." This is the region in which long afterward—so the Bible tells us—Abraham left his native town, Ur of the Chaldees, to make his pioneer journey to Palestine. This is the land where the great cities of Babylon and Nineveh afterward arose; Babylon, where Daniel interpreted the dream of King Nebuchadnezzar, and Nineveh, whence the Assyrians, the fierce conquerors of the ancient world, "came down like a wolf on the fold" against the peaceful Kingdom of Judah. It is the land where, thousands of years later, the famous Arab capital of Bagdad was built; it is the land of Harun al Raschid and the "Arabian Nights," and the land which the British Army conquered in a remarkable campaign against the Turks and Germans. Mesopotamia is a land of color, brilliant life, wonders and romance. Many students and statesmen believe that it will, in days to come, grow fruitful and populous again, that it will once more be great among the countries of the earth. It is a flat region, with wide-stretching plains. For the most part, there are no hills to limit the view of the skies, and the heavens are brilliant upon starry nights.