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. Ivory pillars were common sights in Manyuema, and, hearing of these, one can no longer, wonder at the ivory palace of Solomon. For generations they have used ivory tusks as door-posts and supports to the eaves, until they had become perfectly rotten and worthless. But the advent of the Arabs soon taught them the value of the article. It has now risen considerably in price, though still fabulously cheap. At Zanzibar the value of ivory per frasilah of 35 lbs. weight is from $50 to $60, according to its quality. In Unyanyembe it is about $1-10 per pound, but in Manyuema, it may be purchased for from half a cent to 14 cent's worth of copper per pound of ivory. The Arabs, however, have the knack of spoiling markets by their rapacity and cruelty. With muskets, a small party of Arabs is invincible against such people as those of Manyuema, who, until lately, never heard the sound of a gun. The discharge of a musket inspires mortal terror in them, and it is almost impossible to induce them to face the muzzle of a gun. They believe that the Arabs have stolen the lightning, and that against such people the bow and arrow can have little effect. They are by no means devoid of courage, and they have often declared that, were it not for the guns, not one Arab would leave the country alive; this tends to prove that they would willingly engage in fight with the strangers who had made themselves so detestable, were it not that the startling explosion of gunpowder inspires them with terror.

Into what country soever the Arabs enter, they contrive to render their name and race abominated. But the mainspring of it all is not the Arab's nature, colour, or name, but simply the slave-trade. So long as the slave-trade is permitted to be kept up at Zanzibar, so long will these otherwise enterprising people, the Arabs, kindle gainst them the hatred of the natives throughout Africa.

On the main line of travel from Zanzibar into the interior of Africa these acts of cruelty are unknown, for the very good reason that the natives having been armed with guns, and taught how to use those weapons, are by no means loth to do so whenever an opportunity presents itself. When, too late, they have perceived their folly in selling guns to the natives, the Arabs now begin to vow vengeance on the person who will in future sell a gun to a native. But they are all guilty of the same mistake, and it is strange they did not perceive that it was folly when they were doing so.

In former days the Arab, when protected by his slave escort, armed with guns, could travel through Useguhha, Urori, Ukonongo, Ufipa, Karagwah, Unyoro, and Uganda, with only a stick in his hand; now, however, it is impossible for him or any one else to do so. Every step he takes, armed or unarmed, is fraught with danger. The Waseguhha, near the coast, detain him, and demand the tribute, or give him the option of war; entering Ugogo, he is subjected every day to the same oppressive demand, or to the fearful alternative. The Wanyamwezi also show their readiness to take the same advantage; the road to Karagwah is besieged with difficulties; the terrible Mirambo stands in the way, defeats their combined forces with ease, and makes raids even to the doors of their houses in Unyanyembe; and should they succeed in passing Mirambo, a chief—Swaruru—stands before them who demands tribute by the bale, and against whom it is useless to contend.

These remarks have reference to the slave-trade inaugurated in Manyuema by the Arabs. Harassed on the road between Zanzibar and Unyanyembe by minatory natives, who with bloody hands are ready to avenge the slightest affront, the Arabs have refrained from kidnapping between the Tanganika and the sea; but in Manyuema, where the natives are timid, irresolute, and divided into small weak tribes, they recover their audacity, and exercise their kidnapping propensities unchecked.

The accounts which the Doctor brings from that new region are most deplorable. He was an unwilling spectator of a horrible deed—a massacre committed on the inhabitants of a populous district who had assembled in the market-place on the banks of the Lualaba, as they had been accustomed to do for ages. It seems that the Wamanyuema are very fond of marketing, believing it to be the summum bonum of human enjoyment. They find endless pleasure in chaffering with might and main for the least mite of their currency—the last bead; and when they gain the point to which their peculiar talents are devoted, they feel intensely happy. The women are excessively fond of this marketing, and, as they are very beautiful, the market place must possess considerable attractions for the male sex. It was on such a day amidst such a scene, that Tagamoyo, a half-caste Arab, with his armed slave escort, commenced an indiscriminate massacre by firing volley after volley into the dense mass of human beings. It is supposed that there were about 2,000 present, and at the first sound of the firing these poor people all made a rush for their canoes. In the fearful hurry to avoid being shot, the canoes were paddled away by the first fortunate few who got possession of them; those that were not so fortunate sprang into the deep waters of the Lualaba, and though many of them became an easy prey to the voracious crocodiles which swarmed to the scene, the majority received their deaths from the bullets of the merciless Tagamoyo and his villanous band. The Doctor believes, as do the Arabs themselves, that about 400 people, mostly women and children, lost their lives, while many more were made slaves. This outrage is only one of many such he has unwillingly witnessed, and he is utterly unable to describe the feelings of loathing he feels for the inhuman perpetrators.

Slaves from Manyuema command a higher price than those of any other country, because of their fine forms and general docility. The women, the Doctor said repeatedly, are remarkably pretty creatures, and have nothing, except the hair, in common with the negroes of the West Coast. They are of very light colour, have fine noses, well-cut and not over-full lips, while the prognathous jaw is uncommon. These women are eagerly sought after as wives by the half-castes of the East Coast, and even the pure Omani Arabs do not disdain to take them in marriage.

To the north of Manyuema, Livingstone came to the light-complexioned race, of the colour of Portuguese, or our own Louisiana quadroons, who are very fine people, and singularly remarkable for commercial "'cuteness" and sagacity. The women are expert divers for oysters, which are found in great abundance in the Lualaba.

Rua, at a place called Katanga, is rich in copper. The copper-mines of this place have been worked for ages. In the bed of a stream, gold has been found, washed down in pencil-shaped pieces or in particles as large as split peas. Two Arabs have gone thither to prospect for this metal; but, as they are ignorant of the art of gulch-mining, it is scarcely possible that they will succeed. From these highly important and interesting discoveries, Dr. Livingstone was turned back, when almost on the threshold of success, by the positive refusal of his men to accompany him further. They were afraid to go on unless accompanied by a large force of men; and, as these were not procurable in Manyuema, the Doctor reluctantly turned his face towards Ujiji.

It was a long and weary road back. The journey had now no interest for him. He had travelled the road before when going westward, full of high hopes and aspirations, impatient to reach the goal which promised him rest from his labors—now, returning unsuccessful, baffled, and thwarted, when almost in sight of the end, and having to travel the same path back on foot, with disappointed expectations and defeated hopes preying on his mind, no wonder that the old brave spirit almost succumbed, and the strong constitution almost went to wreck.