Here Stanley fitted together and launched his exploring boat, the _Lady Alice_, in which he had already rendered such excellent service to the cause of geographical science on Lake Victoria Nyanza, and commenced his survey of Lake Tanganyika. Starting from Ujiji, he made a complete circumnavigation of the lake, and verified many observations of that portion which he had previously visited and explored in company with Dr. Livingstone. Stanley, in the course of this survey, settled the question of the river Luguka, which Cameron had conjectured was the outlet of Lake Tanganyika towards the west, and into the system of lakes which form the head waters of the Lualala, or Lomame of Livingstone. According to Stanley, Cameron was both right and wrong with regard to the character of the Luguka River. When Stanley saw it, it was only a creek, running inland through a deep depression, which extended westward for a great distance. But the lake, by constantly increasing its area and raising in level, will eventually, in Stanley’s opinion, find an outlet through the Luguka River. The outbreak of small-pox and fever in the Ujiji district, however, obliged Stanley to make preparations for an immediate departure. With his followers he pushed his way along the right bank of the Lualala to the Nyangwe. This was the most northerly point reached by Cameron, when the latter attempted to solve the mystery of the Congo and its identity with the main drainage line of the Lualala basin. The party travelled overland through Uregga, and after an arduous march of many days through a country filled with many difficulties, being compelled to transport every pound of supplies of all kinds on the shoulders of his men, and even to carry along in a similar manner the exploring boat, the _Lady Alice_, in sections, Stanley at last found himself brought to a standstill, further progress being rendered utterly impracticable owing to the extreme density of the forest. He then crossed over to the left bank, and continued his journey, passing through Northeast Uskusa; but here the difficulties were scarcely less than those encountered on the other side. The jungles were still so dense and the fatigues of the march, owing to the obstacles to be overcome, so harassing, that it seemed impossible to break through the tremendous barrier of the forest. The horrors of his position were still further augmented by the party being opposed at every step by the hostile cannibal savages, who filled the woods and poured into the devoted little band flights of poisoned arrows, killing and wounding many of their number. Every attempt to propitiate them, or even to retaliate and drive them off, was of no avail, as the natives kept under cover. Even the famous “elephant” gun, which it will be remembered Stanley found so useful as a “propitiator” in the earlier stages of his journey from Zanzibar, was now powerless.