“No; I tried to get there, but could not. I have no doubt that Tanganyika as we see it here is really the Upper Tanganyika, that the Albert Nyanza of Baker is the Lower Tanganyika, and that they are connected by a river.” Poor fellow! Did ever mortal man cling so to a delusion, put such faith in native stories and old traditions. Stanley proposed to lend his assistance to the doctor, to settle the question of Tanganyika’s northern outlet. The doctor consented; and now began a journey, which was wholly unlike the doctor’s five year tramp. He was in a boat and had a congenial and enthusiastic companion. [Illustration: LIVINGSTONE AND STANLEY ON TANGANYIKA.] Tanganyika, like the Albert Nyanza which pours a Nile flood, and Nyassa which flows through the Shiré into the Zambesi, is an immense trough sunk far below the table-land which occupies the whole of Central Africa. Its surrounding mountains are high. Its length is nearly 500 miles, its waters deep, clear and brackish. Whither does it send its surplus waters? We have seen that Livingstone was sure it emptied through the Nile. This was what he and Stanley were to prove. In November 1871, three weeks after the two had so providentially met at Ujiji, they were on their voyage in two canoes. They coasted till they came to what Burton and Speke supposed to be the end of the lake, which turned out to be a huge promontory. Beyond this the lake widens and stretches for sixty miles further, overhung with mountains 7000 feet high. At length they reached the northern extremity where they had been assured by the natives that the waters flowed through an outlet. No outlet there. On the contrary seven broad inlets puncturing the reeds, through which the Rusizi River poured its volume of muddy water into the lake, from the north. Here was disappointment, yet a revelation. No Nile source in Tanganyika——at least not where it was expected to be found. Its outlet must be sought for elsewhere. Some thought it might connect eastward with Nyassa. But what of the great water-shed between the two lakes? Others thought it might have its outpour this way and that. Livingstone, puzzled beyond propriety, thought it might have an underground outlet into the Lualaba, and even went so far as to repeat a native story in support of his notion, that at a point in the Ugoma mountains the roaring of an underground river could be heard for miles.