rise of the river is the rain of summer. This he borrows from Aristotle, who borrowed it from Thrasyalces the Thasian (one of the ancient writers on physics), Thrasyalces from some other person, and he from Homer, who calls the Nile “heaven-descended:” “back to Egypt’s heaven-descended stream.”[804] But I quit this subject, since it has been discussed by many writers, among whom it will be sufficient to specify two, who have (each) composed in our times a treatise on the Nile, Eudorus and Aristo the Peripatetic philosopher. [They differ little from each other] except in the order and disposition of the works, for the phraseology and execution is the same in both writers. (I can speak with some confidence in this matter), for when at a loss (for manuscripts) for the purpose of comparison and copy, I collated both authors.[805] But which of them surreptitiously substituted the other’s account as his own, we may [CAS. 790] go to the temple of Ammon to be informed. Eudorus accused Aristo, but the style is more like that of Aristo. The ancients gave the name of Egypt to that country only which was inhabited and watered by the Nile, and the extent they assigned to it was from the neighbourhood of Syene to the sea. But later writers, to the present time, have included on the eastern side almost all the tract between the Arabian Gulf and the Nile (the Æthiopians however do not make much use of the Red Sea); on the western side, the tract extending to the Auases and the parts of the sea-coast from the Canobic mouth of the Nile to Catabathmus, and the kingdom of Cyrenæa. For the kings who succeeded the race of the Ptolemies had acquired so much power, that they became masters of Cyrenæa, and even joined Cyprus to Egypt. The Romans, who succeeded to their dominions, separated Egypt, and confined it within the old limits. The Egyptians give the name of Auases (Oases) to certain inhabited tracts, which are surrounded by extensive deserts, and appear like islands in the sea. They are frequently met with in Libya, and there are three contiguous to Egypt, and dependent upon it. This is the account which we have to give of Egypt in general and summarily. I shall now describe the separate parts of the country and their advantages. 6. As Alexandreia and its neighbourhood occupy the greatest and principal portion of the description, I shall begin with it. In sailing towards the west, the sea-coast from Pelusium to the Canobic mouth of the Nile is about 1300 stadia in extent, and constitutes, as we have said, the base of the Delta. Thence to the island Pharos are 150 stadia more. Pharos is a small oblong island, and lies quite close to the continent, forming towards it a harbour with a double entrance. For the coast abounds with bays, and has two promontories projecting into the sea. The island is situated between these, and shuts in the bay, lying lengthways in front of it.