r Egypt, at first a
swamp, was nearly, if not totally, uninhabited. But when at
length this country had been drained by the canals and dikes
which Sesostris constructed, population was introduced
there, and wars arose which proved fatal to the power of
Thebes. Commerce then took another route, and descended to
the point of the Red Sea, to the canals of Sesostris (see
Strabo), and wealth and activity were transferred to
Memphis. This is manifestly what Diodorus means when he
tells us (lib. i. sect. 2), that as soon as Memphis was
established and made a wholesome and delicious abode, kings
abandoned Thebes to fix themselves there. Thus Thebes
continued to decline, and Memphis to flourish, till the time
of Alexander, who, building Alexandria on the border of the
sea, caused Memphis to fall in its turn; so that prosperity
and power seem to have descended historically step by step
along the Nile; whence it results, both physically and
historically, that the existence of Thebes was prior to that
of the other cities. The testimony of writers is very
positive in this respect. "The Thebans," says Diodorus,
"consider themselves as the most ancient people of the
earth, and assert, that with them originated philosophy and
the science of the stars. Their situation, it is true, is
infinitely favorable to astronomical observation, and they
have a more accurate division of time into mouths and years
than other nations" etc.

What Diodorus says of the Thebans, every author, and himself
elsewhere, repeat of the Ethiopians, which tends more firmly
to establish the identity of this place of which I have
spoken. "The Ethiopians conceive themselves," says he, lib.
iii., "to be of greater antiquity than any other nation: and
it is probable that, born under the sun's path, its warmth
may have ripened them earlier than other men. They suppose
themselves also to be the inventors of divine worship, of
festivals, of solemn assemblies, of sacrifices, and every
other religious practice. They affirm that the Egyptians
are one of their colonies, and that the Delta, which was
formerly sea, became land by the conglomeration of the earth
of the higher country which was washed down by the Nile.
They have, like the Egyptians, two species of letters,