In ship-building the Phenicians were confessedly superior; they are said to have discovered navigation.[533] The ancient forests of cedar and cypress which rose immediately above their shores supplied the best wood, which resisted decay for an extraordinary length of time even in salt water. Much as the Phenicians used these forests in the course of a thousand years for building their ships, their palaces, and temples, as well as for exportation, they provided even in the third century B.C. a material which for extent, size, and beauty won the admiration of the Greeks.[534] The oldest ship of the Phenicians which continued through all time in use as a trading-vessel was the _gaulos_, a vessel with high prow and stern, both of which were similarly rounded. It was propelled by a large sail and by rowers, from 20 to 30 in number. Besides the gaulos, there was the long and narrow fifty-oar, which served for a merchantman and pirate-ship as well as for a ship of war, and after the discovery of the silver land the large and armed merchantman, the ship of Tarshish. Isaiah enumerates the ship of Tarshish among the costly structures of men.[535] Ezekiel compares Tyre to a proud ship of the sea. We know that the great transport-ships and merchantmen of the Phenicians and Carthaginians could take about 500 men on board. The Byblians were considered the best ship-builders. The keels of the ships, like the masts, were made of cedar; the oars were of oak, supplied by the oak forests of the table-land of Bashan. The mariners of Sidon and Aradus were considered the best rowers. The Greeks praise the strict and careful order on board a Phenician ship, the happy use of the smallest spaces, the accuracy in distributing and placing the lading, the experience, wisdom, activity, and safety of the Phenician pilots and officers.[536] Others commend the great sail and oar power of the Phenician ships. They could sail even against the wind, and make fortunate voyages in the stormy season of the year. While the Greeks steered by the Great Bear, which, if a more visible, was a far more uncertain guide, the Phenicians had at an early time discovered a less conspicuous but more trustworthy guide in the polar star, which the Greeks call the "Phenician star." The Greeks themselves allow that this circumstance rendered the voyages of the Phenicians more accurate and secure. On an average the Phenician ships, which as a rule did not set out before the end of February, and returned at the end of October, accomplished 120 miles in 24 hours; but ships that were excellently built and equipped, and sufficiently manned, ran about 150 miles.[537] In the fifteenth century the galleys of Venice could run from 50 to 100 miles in the Mediterranean in the 24 hours. The excellence of the Phenician navy survived the independence of the cities. Inclination towards, and pleasure in navigation, as well as skill in it, were always to be found among the populations of those cities.