When these two things have been accomplished, then, and not till then, can the mystery of the Nile be explained. The two countries through which the marvellous lacustrine river, the Lualaba, flows, with its manifold lakes and broad expanse of water, are Rua (the Uruwwa of Speke) and Manyuema. For the first time Europe is made aware that between the Tanganika and the known sources of the Congo there exist teeming millions of the negro race, who never saw, or heard of the white people who make such a noisy and busy stir outside of Africa. Upon the minds of those who had the good fortune to see the first specimen of these remarkable white races in Dr. Livingstone, he seems to have made a favourable impression, though, through misunderstanding his object, and coupling him with the Arabs, who make horrible work there, his life was sought after more than once. These two extensive countries, Rua and Manyuema, are populated by true heathens, governed, not as the sovereignties of Karagwah, Urundi, and Uganda, by despotic kings, but each village by its own sultan or lord. Thirty miles outside of their own immediate settlements, the most intelligent of these small chiefs seem to know nothing. Thirty miles from the Lualaba, there were but few people who had ever heard of the great river. Such ignorance among the natives of their own country naturally increased the labours of Livingstone. Compared with these, all tribes and nations in Africa with whom Livingstone came in contact may be deemed civilized, yet, in the arts of home manufacture, these wild people of Manyuema were far superior to any he had seen. Where other tribes and nations contented themselves with hides and skins of animals thrown negligently over their shoulders, the people of Manyuema manufactured a cloth from fine grass, which may favorably compare with the finest grass cloth of India. They also know the art of dyeing them in various colours--black, yellow, and purple. The Wangwana, or freed-men of Zanzibar, struck with the beauty of the fabric, eagerly exchange their cotton cloths for fine grass cloth; and on almost every black man from Manyuema I have seen this native cloth converted into elegantly made damirs (Arabic)--short jackets. These countries are also very rich in ivory. The fever for going to Manyuema to exchange tawdry beads for its precious tusks is of the same kind as that which impelled men to go to the gulches and placers of California, Colorado, Montana, and Idaho; after nuggets to Australia, and diamonds to Cape Colony. Manyuema is at present the El Dorado of the Arab and the Wamrima tribes. It is only about four years since that the first Arab returned from Manyuema, with such wealth of ivory, and reports about the fabulous quantities found there, that ever since the old beaten tracks of Karagwah, Uganda, Ufipa, and Marungu have been comparatively deserted. The people of Manyuema, ignorant of the value of the precious article, reared their huts upon ivory stanchions.