His safety was for a time despaired of, but having at last recovered he sent Polyperchon with part of the army to Babylon. Having himself embarked with a very select company of his friends, he made a voyage along the shores of the ocean. On his reaching the city of King Ambigerus[408] the inhabitants who had heard that he was invulnerable by steel, armed their arrows with poison, which thus inflicted a double wound. With this deadly weapon they killed great numbers of the enemy and repulsed them from the walls. Among many others that were wounded was Ptolemy, but he was rescued from danger just when he appeared to be dying, as soon as he had swallowed a potion prepared from a particular herb which had been revealed to the king in a vision as being an antidote to the poison. The greater part of the army was saved by the same remedy. Alexander having taken the city by storm poured out a libation to the ocean, praying at the same time for a prosperous return to his own country. He was then carried down with the tide in his favour to the mouth of the river Indus. And then like a victor who had triumphantly driven his chariot round the goal, he fixed the frontiers of his empire, having advanced till the deserts at the world’s end barred his farther progress by land, and till seas were no longer navigable. As a monument of his achievements he founded in those parts the city of Barce.[409] He erected altars also, and on departing left one of his friends to be governor of the maritime Indians. As he intended to march homewards by land, and had learned that his route would lie through arid wastes, he ordered wells to be dug at convenient places. Since these were found to yield a copious supply of water he effected his return to Babylon. FIFTEENTH BOOK _Chapter IV.—Seleucus Nicator subjugates the Bactrians and enters India—The history of Sandrocottus who was then King of India—Seleucus makes a treaty of peace with him and returns to the West_ [Illustration: FIG. 14.—SELEUCUS NICATOR.]