What then became of Cameron’s wonderful story about the outlet of the Lukuga? Stanley looked carefully into this. He found a decided current running down the river into the lake. He pushed up the river to the narrow gorge in the mountains, beyond which the natives said the Lukuga ran westward toward the Lualaba. There he found a true and false story. In this ancient mountain gap was a clear divide of the Lukuga waters. Part ran by a short course into Tanganyika; part westward into the Lualaba. Stanley was of the opinion that the waters of the lake were rising year by year, and that in the course of time there would be a constant overflow through the Lukuga and into the Lualaba, as perhaps there had been long ages ago. Even now there is not much difference between the level of the lake and the marshes found in the mountain gap beyond, and Mr. Hore, who has since visited the Lukuga gap, says he found a strong current setting out of the lake westward, so that the time may have already come which Stanley predicted. This Lukuga gap probably represents the fracture of an earthquake through which the waters of the lake escaped in former ages and which has been its safety-valve at certain times since. When it is full it may, therefore, be said to have an outlet. When not full its waters pass off by evaporation. It is only a semi-occasional contribution——if one at all——to the floods of the great Congo, and in this respect has no counterpart in the world. All of which settles the point of its connection with the Nile, and leaves the sources of that river to the north. Had Livingstone known this he could have saved himself the last two years of his journey and the perils and sickness which led to his death in the wilderness. [Illustration: A WEIR BRIDGE.] And now Stanley had clarified the situation behind him, which stretched over 800 miles of African continent. But looking toward the Atlantic, there lay stretched a 1000 miles of absolutely unknown country. Into this he plunged, and pursued his course till he struck the great northward running river——the Lualaba. The path was broken and difficult. Rivers ran frequent and deep, and crossing was a source of delay, except where, occasionally, ingeniously constructed bridges were found, which answered the double purpose of crossing and fish-weir. These are built of poles, forty feet long, driven into the bed of the stream and crossing each other near the top. Other poles are laid lengthwise at the point of junction, and all are securely tied together with bamboo ropes. Below them the nets of the fishermen are spread, and over them a person may pass in safety. Stanley’s party had been greatly thinned out, but it still consisted of 140 men. Cameron had found it impossible to follow the Lualaba. Livingstone had tried it again and again, to meet a more formidable obstacle in the hostility of the natives than in the forests, fens and animals. Could Stanley master its secret?