11. These troubles came from abroad. Egypt, surrounded on all sides by nomad tribes, had often suffered from their irruptions, which sometimes poured in from the south, sometimes from the east. But never were these invasions so frequent and durable as in the period which immediately followed the administration of Joseph. Lower Egypt was overrun by the Bedouin Arabs, whose chieftains, called by the Egyptians _Hyksos_, settled in the country, fortified Avaris, or Pelusium, and extended their dominion to Memphis, which they made probably the seat of their government. They are depicted as the oppressors of religion, and of the caste of priests; but when we consider that Moses flourished in their time, we are led to infer that, like the Mongols in China, they must have gradually adopted Egyptian manners and civilization. They do not appear to have gained possession of Thebes in Upper Egypt; and it seems highly probable, that the long struggle against them was never, or at least but for a short time, suspended. The dominion of the Arabian Hyksos falls between B. C. 1800-1600; and consequently was contemporary with Moses and the exodus of the Jews. Josephus gives 500 years to their dominion, in which he probably comprises the long periods of earlier wars. 12. Defeat, and final expulsion of the Hyksos from Upper Egypt by Thutmosis king of Thebes. The consequence of this event was not only the restoration of freedom and independence to Egypt, but also the union of the different states into one kingdom; as the rulers of Thebes now became monarchs over all Egypt. This expulsion of the Hyksos, which in itself cannot be considered otherwise than as a vast national effort, must have been the more deeply impressed on the memory of the people, as it laid the foundation of the splendid period which immediately followed. The expulsion of the Hyksos appears to have been one of the chief subjects on which the Egyptian artists exercised their talents: it is supposed to have been represented upon one of the large temples in Thebes. Denon, plate cxxxiii. SECOND PERIOD. _From the Sesostridae until the sole dominion of Psammetichus. B. C. 1500-650._ The sources for this period are the same as for the foregoing; and the history still preserves the character of records handed down by hieroglyphics. To this period belongs the line of kings subsequent to Sesostris, given both by Herodotus and Diodorus. Those two historians nearly agree, if we regard Herodotus's line of kings, not as uninterrupted, but as the fragments of a series deduced solely from public monuments: this will be demonstrated by the following table, in which the predecessors of Sesostris have likewise been indicated. HERODOTUS. DIODORUS. _Menes._ _Menes._