Stanley now took his whole expedition to Uganda, and after spending some months with the King he passed on to Lake Tanganyika, crossing to Ujiji, where he arrived in May 1876. Here five years before he had found Livingstone.
"We launched our boat on the lake and, circumnavigating it, discovered that there was only a periodical outlet to it. Thus, by the circumnavigation of the two lakes, two of the geographical problems I had undertaken to solve were settled. The Victoria Nyanza had no connection with the Tanganyika. There now remained the grandest task of all. Is the Lualaba, which Livingstone had traced along a course of nearly thirteen hundred miles, the Nile, the Niger, or the Congo? I crossed Lake Tanganyika with my expedition, lifted once more my gallant boat on our shoulders, and after a march of nearly two hundred and twenty miles arrived at the superb river. Where I first sighted it, the Lualaba was fourteen hundred yards wide, pale grey in colour, winding slowly from south and by east. We hailed its appearance with shouts of joy, and rested on the spot to enjoy the view. I likened it to the Mississippi as it appears before the impetuous, full-volumed Missouri pours its rusty brown water into it. A secret rapture filled my soul as I gazed upon the majestic stream. The great mystery that for all these centuries Nature had kept hidden away from the world of science was waiting to be solved. For two hundred and twenty miles I had followed the sources of the Livingstone River to the confluence, and now before me lay the superb river itself. My task was to follow it to the ocean."
Pressing on along the river, they reached the Arab city of Nyangwe, having accomplished three hundred and thirty-eight miles in forty-three days. And now the famous Arab Tippu-Tib comes on the scene, a chief with whom Stanley was to be closely connected hereafter. He was a tall, black-bearded man with an intelligent face and gleaming white teeth. He wore clothes of spotless white, his fez was smart and new, his dagger resplendent with silver filigree. He had escorted Cameron across the river to the south, and he now confirmed Stanley in his idea that the greatest problem of African geography, "the discovery of the course of the Congo," was still untouched.
"This was momentous and all-important news to the expedition. We had arrived at the critical point in our travels," remarks Stanley. "What kind of a country is it to the north along the river?" he asked.
"Monstrous bad," was the reply. "There are large boa-constrictors in the forest suspended by their tails, waiting to gobble up travellers. You cannot travel without being covered by ants, and they sting like wasps. There are leopards in countless numbers. Gorillas haunt the woods. The people are man-eaters. A party of three hundred guns started for the forest and only sixty returned."
Stanley and his last remaining white companion, Frank Pocock, discussed the somewhat alarming situation together. Should they go on and face the dwarfs who shot with poisoned arrows, the cannibals who regarded the stranger as so much meat, the cataracts and rocks—should they follow the "great river which flowed northward for ever and knew no end"?
"This great river which Livingstone first saw, and which broke his heart to turn away from, is a noble field," argued Stanley. "After buying or building canoes and floating down the river day by day, either to the Nile or to some vast lake in the far north or to the Congo and the Atlantic Ocean."
"Let us follow the river," replied the white man.
So, accompanied by Tippu-Tib, with a hundred and forty guns and seventy spearmen, they started along the banks of the river which Stanley now named the Livingstone River.
"On the 5th of November 1876," says Stanley, "a force of about seven hundred people, consisting of Tippu-Tib's slaves and my expedition departed from the town of Nyangwe and entered the dismal forest-land north. A straight line from this point to the Atlantic Ocean would measure one thousand and seventy miles; another to the Indian Ocean would measure only nine hundred and twenty miles; we had not reached the centre of the continent by seventy-five miles.