Darius, king of Persia, attempted to open this trade in a much more worthy and liberal manner, as he sent ships down the river Indus into the ocean, whence they entered the Red Sea. It is probable, in this voyage, he acquired all the knowledge necessary for establishing this trade in Persia; for he must have passed through the Persian Gulf, and along the whole eastern coast of Arabia; he must have seen the marts of perfumes and spices that were at the mouth of the Red Sea, and the manner of bartering for gold and silver, as he was necessarily in those trading places which were upon the very same coast from which the bullion was brought. I do not know, then, why M. de Montesquieu[303] has treated this expedition of Darius so contemptuously, as it appears to have been executed without great trouble or expence, and terminated without loss or hardship; the strongest proof that it was at first wisely planed. The prince himself was famous for his love of learning, which we find by his anxiety to be admitted among the Magi, and the sense he had of that honour, in causing it to be engraved upon his tomb. The expedition of Alexander into India was, of all events, that which most threatened the destruction of the commerce of the Continent, or the dispersing it into different channels throughout the East: First, by the destruction of Tyre, which must have, for a time, annihilated the trade by the Arabian Gulf; then by his march through Egypt into the country of the Shepherds, and his intended further progress into Ethiopia to the head of the Nile. If we may judge of what we hear of him in that part of his expedition, we should be apt not to believe, as others are fond of doing, that he had schemes of commerce mingled with those of conquests. His anxiety about his own birth at the Temple of Jupiter Ammon, this first question that he asked of the priest, “Where the Nile had its source,” seemed to denote a mind busied about other objects; for else he was then in the very place for information, being in the temple of that horned god[304], the deity of the Shepherds, the African carriers of the Indian produce; a temple which, though in the midst of sand, and destitute of gold or silver, possessed more and better information concerning the trade of India and Africa, than could be found in any other place on the Continent. Yet we do not hear of one question being made, or one arrangement taken, relative to opening the India trade with Thebes, or with Alexandria, which he built afterwards.