The next important visit to the Congo River was paid by Captain Owen's Expedition, when homeward bound in 1826. The "Leven" and "Barracouta" surveyed the stream twenty-five miles from its mouth during a week, beginning with January 1, just after the highest flood. At thirteen miles out at sea the water was fresh and of a dingy red; it fermented and remained in a highly putrescent state for some days, tarnishing silver; kept for four months, it became perfectly clear and colourless, without depositing any sediment. This reminds us of the changing colours, green, red and milky white, to which the Nile and all great African rivers that flood periodically are subject.[FN#15] The next traveller that deserves notice is the unfortunate Douville,[FN#16] through whose tissue of imposture runs a golden thread of truth. As his first journey, occupying nearly two of the three volumes, was probably confined to the Valley of the Cuanza River, so his second, extending beyond the equator, and to a meridian 25° east of Paris, becomes fable as he leaves the course of the Loge Stream. Yet, although he begins by doubting that the Coango and the Zaire are the same waters, he ends by recognizing the fact, and his map justly lays down the Fleuve Couango dit Zaire à son embouchure. Whether the tale of the mulatto surveyor be fact or not is of little matter: the adventurer had an evident inkling of the truth. A flood of side light is thrown upon the head waters of the Congo River by Dr. Livingstone's first memorable journey (1852-56), across Africa, and by the more dubious notices of his third expedition The Introduction (p. xviii.) to Captain Tuckey's narrative had concluded from the fact of the highest flood being in March, and the lowest level about the end of August, that at least one branch of the river must pass through some portion of the northern hemisphere. The general observations affixed to "Narrative" (p. 346), contain these words: "If the rise of the Zaire had proceeded from rains to the southward of the Line, swelling the tributary streams and pouring in mountain torrents the waters into the main channel, the rise would have been sudden and impetuous." Of course the writer had recourse to the "Lakes of Wangara," in north latitude 12° to 15°: that solution of the difficulty belonged inevitably to his day. Captain Tuckey (p. 178) learned, at Mavunda, that ten days of canoeing would take him beyond all the rapids to a large sandy islet which makes two channels, one to the north-west, the other to the north-east. In the latter there is a fall above which canoes are procurable: twenty days higher up the river issues, by many small streams, from a great marsh or lake of mud.[FN#17] Again, a private letter written from the "Yellala" (p. 343) declares that "the Zaire would be found to issue from a lake or a chain of lakes considerably to the north of the Line; and, so far from the low state of the river in July and August militating against the