We possess but little knowledge of the construction and equipment of the Egyptian ships. According to Herodotus, they were built of planks of the thorn-tree, fastened together, like tiles, with a great number of wooden pins, and were entirely without ribs. On the inside papyrus was used for stopping the crevices. The sails were made of the papyrus, or of twisted rushes. These vessels were always towed up the Nile, while they descended the stream in the following manner. The current not acting with sufficient force upon their flat bottoms, the sailors hung a bundle of tamarisk over the prow and let it down under the keel by a rope: the stream, bearing upon this bundle, carried the boat along with great celerity. The Jews, whose country was ill situated for commerce by sea, were even more averse than the Egyptians to intercourse with foreigners and to maritime occupations. Joppa was the only seaport of Judea and Jerusalem, and into it many of the articles used by Solomon in the construction of the Temple were imported. During Solomon's reign, he employed the ships of his ally, Hiram, King of Tyre, in commercial avocations, for which his own people were not fitted. It is among the Jews, whose history is given in the Scripture with so much detail, that we should naturally look for the earliest geographical records. The sacred writers, however, seem to have entertained no idea of any system of geography, having been occupied with the affairs of the world to come, to the total exclusion of the concerns of the mundane earth. They do not even allude to any such branch of learning as being then in existence. It is clear that the Hebrews never attempted to form any theory upon the structure and shape of the globe. Their ideas with regard to the boundaries of the known world may be vaguely inferred from the tenth chapter of Genesis, from the chapters treating of the commerce of Tyre, and from various detached allusions in the prophets. The idea, common to all uninstructed people, that the earth is a flat surface and the heaven a firmament or curtain spread over it, prevails throughout the Bible. The abode of darkness and of the shadow of death was conceived to be a deep pit beneath it. One sacred writer speaks of the earth as being "hung upon nothing;" another speaks of the "pillars of the earth," and another of the "pillars of heaven." These allusions show sufficiently that, though the writers of those days were impressed by the external view of the grand scenes of nature, they did not endeavor to group them into any regular system.