The attention of geographers and scientific men was now turned to the great Lake Tanganyika, about which very little was known. The outlet of the lake was as yet undiscovered. The secret sources of the Nile were unknown, and the great river that reaches the Congo coast from the interior was then, so far as men knew, lost in the foam of the cataracts above. Even the already famous lake known as the Victoria Nyanza was indistinctly sketched on the maps, and people familiar with African exploration were uncertain whether that great body of water was a lake or a chain of lakes. Stanley was asked by the editor of the _London Daily Telegraph_ if he could settle these great questions if he were commissioned to go to Africa. He replied, "While I live there will be something done. If I survive the time required to perform all the work, all shall be done." James Gordon Bennett was asked by cable if he would join in the new expedition. His sententious reply flashed under the ocean was: "Yes. Bennett." And Stanley's second great work was already determined upon. Only six weeks were allowed for preparation, and when it was noised abroad that Stanley was taking another expedition into the heart of Africa, he was overwhelmed with offers of volunteer assistants, and with a great variety of strange contrivances to help him on his journey. Finally, all preparations being concluded, he left England August 15, 1874, accompanied by only three white men, Frank and Edward Pocock and Frederick Barker. These men, with the goods and other needed articles for the expedition, were sent on ahead, and twenty months after his last previous departure from Zanzibar, Stanley was once more at that point of departure, ready to begin his preparations for another plunge into the heart of the Dark Continent. Some of the black men who had been with him on his previous journey, when he searched for Livingstone, were found at Zanzibar, and they were all eager to go with him again, and when he was ready to depart he had in his company 224 persons, some of the black men taking their wives with them. The company after leaving Zanzibar landed at Bergamoyo, on the mainland, November 13, 1874, and five days later his column boldly advanced into the heart of the Dark Continent. The general direction of the expedition was at first nearly westerly, then turning to the north it was aimed for Victoria Nyanza. The march was obstructed by marshy regions, overflowing with recent rains. Moist exhalations and poisonous vapors prevailed, and the first month was a gloomy one. Stanley's own weight in thirty-eight days fell from 180 pounds to 130 pounds, and the three young Englishmen with him were greatly reduced in strength and flesh. One of these, Edward Pocock, was prostrated, and though he was carried back to the high, dry table land nearer the coast, he died and was buried in that lonely region.