visitors, traders, and colonists, and the Persian influence came with
Cambyses and others. Roman Africa was bounded by the desert, but at times
came into contact with the blacks across the Sahara and in the valley of
the Nile. After the breaking up of the Roman Empire the Greek and Latin
Christians filtered through Africa, followed finally by a Germanic
invasion in 429 A.D.

In the seventh century the All-Mother, Asia, claimed Africa again for her
own and blew a cloud of Semitic Mohammedanism all across North Africa,
veiling the dark continent from Europe for a thousand years and converting
vast masses of the blacks to Islam. The Portuguese began to raise the veil
in the fifteenth century, sailing down the Atlantic coast and initiating
the modern slave trade. The Spanish, French, Dutch, and English followed
them, but as traders in men rather than explorers.

The Portuguese explored the coasts of the Gulf of Guinea, visiting the
interior kingdoms, and then passing by the mouth of the Congo proceeded
southward. Eventually they rounded the Cape of Good Hope and pursued their
explorations as far as the mountains of Abyssinia. This began the modern
exploration of Africa, which is a curious fairy tale, and recalls to us
the great names of Livingstone, Burton, Speke, Stanley, Barth,
Schweinfurth, and many others. In this way Africa has been made known to
the modern world.

The difficulty of this modern lifting of the veil of centuries emphasizes
two physical facts that underlie all African history: the peculiar
inaccessibility of the continent to peoples from without, which made it so
easily possible for the great human drama played here to hide itself from
the ears of other worlds; and, on the other hand, the absence of interior
barriers--the great stretch of that central plateau which placed