at certain periods, when ambition for extended empire dictated the
reduction of her provinces in detail. But in the long intervals,
during which there was no attempt to enforce political control, regular
relations were maintained along the lines of trade and barter. And in
any estimate of the possible effect of foreign influence upon Hebrew
thought, it is important to realize that some of the channels through
which in later periods it may have acted had been flowing since the dawn
of history, and even perhaps in prehistoric times. It is probable that
Syria formed one of the links by which we may explain the Babylonian
elements that are attested in prehistoric Egyptian culture.(1) But
another possible line of advance may have been by way of Arabia and
across the Red Sea into Upper Egypt.

(1) Cf. _Sumer and Akkad_, pp. 322 ff.; and for a full
discussion of the points of resemblance between the early
Babylonian and Egyptian civilizations, see Sayce, _The
Archaeology of the Cuneiform Inscriptions_, chap. iv, pp.
101 ff.

The latter line of contact is suggested by an interesting piece of
evidence that has recently been obtained. A prehistoric flint knife,
with a handle carved from the tooth of a hippopotamus, has been
purchased lately by the Louvre,(1) and is said to have been found at
Gebel el-'Arak near Naga' Hamâdi, which lies on the Nile not far below
Koptos, where an ancient caravan-track leads by Wâdi Hammâmât to the
Red Sea. On one side of the handle is a battle-scene including some
remarkable representations of ancient boats. All the warriors are nude
with the exception of a loin girdle, but, while one set of combatants
have shaven heads or short hair, the others have abundant locks falling
in a thick mass upon the shoulder. On the other face of the handle is