ZANZIBAR. 13 settling down at Unyanyembe, Ujiji, or other trade centres of the interior, send out their principal slaves to buy ivory and slaves, which they gradually collect at their headquarters, returning after a lapse of several years to Zanzibar to dispose of their merchandise and to lay in a fresh stock of goods with which to renew their trading. It not unfrequently happens that the head slaves who are sent in this way to trade by the Arab merchants, squander or lose the goods entrusted to them, and being afraid, under such circumstances, to return to their master's house or to Zanzibar, they settle down in the country where they happen to be, and form small colonies, keeping to a great extent aloof from the natives of the country. Such colonies may be found in Karagwe, Uganda, and all the more distant countries to which the Arab traders have penetrated, and have been useful in preparing the way for the explorer and the missionary by disseminating the knowledge of the Swahili language. The most wealthy class in Zanzibar is that of the Banyans: they are the bankers and money-lenders of the place, and advance money to the Arab merchants at enormous rates of interest to purchase the goods with which they trade. The Hindus are a considerable body as far as numbers go, and may generally be found in the coast towns of the mainland, where they .are usually engaged in buying bees'-wax, orchilla weed, indiarubber, copal, etc., from