Sir Henry Rawlinson has drawn attention to the mention of the ships of Ur in early inscriptions, and the connection of these very ancient vessels with those of Ethiopia. The Babylonian traders at a very remote period voyaged to India and Africa for gold and other articles to use in the arts and to supply the demand of markets. The Euphrates' banks were the ancient quays at which the primitive navigators loaded and unloaded their vessels. They proceeded by the Persian Gulf into the ocean, and there they were guided by landmarks and by the heavenly bodies. These voyages may have continued from the time when Ur was a great city, B.C. 2300, down to the period of the Persian empire, when Babylon began to decline. During all this period, as afterwards, the navigators of the Indian Ocean, whether Babylonian, Arabian, Phoenician, or Egyptian, were trading, aided by the monsoons, along the African and Asiatic coasts, and conveying knowledge from one country to another.