The ethnologist need only go to Zanzibar to become acquainted with all the different tribes to the centre of the continent on that side, or to Congo to find the other half south of the equator there.
Some few freed slaves take service in vessels, of which they are especially fond; but most return to Africa to trade in slaves and ivory.
All slaves learn the coast language, called at Zanzibar Kisuahili; and therefore the traveller, if judicious in his selections, could find there interpreters to carry him throughout the eastern half of South Africa.

To the north of the equator the system of language entirely changes.
Laziness is inherent in these men, for which reason, although extremely powerful, they will not work unless compelled to do so.

Having no God, in the Christian sense of the term, to fear or worship, they have no love for truth, honour, or honesty.

Controlled by no government, nor yet by home ties, they have no reason to think of or look to the future.

Any venture attracts them when hard-up for food; and the more roving it is, the better they like it.