investigate the course of the coasting voyage to Arabia, and who went as far as the island of Tylus, but durst not pass beyond that point. Androsthenes[943] was despatched with another triacontor and sailed to a part of the peninsula of Arabia. Hieron of Soli the pilot also received a triacontor from Alexander and advanced farthest of those whom he despatched to this region; for he had received instructions to sail round the whole Arabian peninsula as far as the Arabian Gulf near Egypt over against Heroöpolis.[944] Although he coasted along the country of the Arabs to a great distance, he durst not go as far as he was ordered; but returning to Alexander he reported that the size of the peninsula was marvellous, being only a little smaller than the country of the Indians, and its extremity projected far into the Great Sea.[945] Nearchus indeed in his voyage from India had seen this stretching out a little, before he turned aside into the Persian Gulf, and he was almost induced to cross over to it. The pilot Onesicritus thought they ought to have gone thither; but Nearchus says that he himself prevented it, so that after sailing right round the Persian Gulf he might be able to give a report to Alexander that he had accomplished the voyage on which he had sent him. For Nearchus said he had not been despatched to navigate the Great Sea, but to explore the land bordering on the sea, to find out what men inhabit it, to discover the harbours and rivers in it, to ascertain the customs of the people, and to see if any of the country was fertile and if any was sterile. This was the reason why Alexander’s naval expedition returned in safety; for if it had sailed beyond the deserts of Arabia, it would not have returned in safety. This is said also to have been the reason why Hieron turned back.[946] CHAPTER XXI. DESCRIPTION OF THE EUPHRATES AND THE PALLACOPAS.