It is also as undeniable that, if the supply to a body of water be greater than its evaporation, the quantity of the water must be increased until the receptacle—whether pool, pond, or lake—overflows and obtains an outlet. [Illustration: UBUJWÉ AND UGUHA HEAD-DRESS.] [Illustration: UGUHA HEAD-DRESS.] In the instance of the Tanganika we have a fresh-water lake, which—according to the evidence of native Arabs and the observation of several travellers—is steadily rising. We have also seen in the Lukuga the first symptoms of that overflowing which must come. At present there are only a few inches of mud-banks and a frail barrier of papyrus and reeds to interpose between the waters of the lake and its destiny, which it is now, year by year, steadily approaching. When the Tanganika has risen 3 feet higher, there will be no surf at the mouth of the Lukuga, no sill of sand, no oozing mud-banks, no rush-covered old river course, but the accumulated waters of over a hundred rivers will sweep through the ancient gap with the force of a cataclysm, bearing away on its flood all the deposits of organic débris at present in the Lukuga Creek, down the steep incline to swell the tribute due to the mighty Livingstone. _July 21._—On the 21st of July we sailed from the mouth of the future outlet Lukuga by Cape Kahangwa, to the Arab crossing-place near Kasengé Island. The Waguha, along whose country we had voyaged south since leaving Tembwé, are an unusually ceremonious people. They are the first specimens of those nations among whom we are destined to travel in our exploration of the western regions. [Illustration: A WOMAN OF UGUHA.] The art of the coiffeur is better known here than in any portion of Africa east of Lake Tanganika. The “waterfall” and “back-hair” styles are superb, and the constructions are fastened with carved wooden or iron pins. Full dress includes a semicircle of finely plaited hair over the forehead painted red, ears well ochred, the rest of the hair drawn up taut at the back of the head, overlaid and secured by a cross-shaped flat board, or with a skeleton crown of iron; the head is then covered with a neatly tasselled and plaited grass cloth, like a lady’s breakfast-cap, to protect it from dust. In order to protect such an elaborate construction from being disordered, they carry a small head- rest of wood stuck in the girdle. [Illustration: UHYEYA HEAD-DRESS.] Their mode of salutation is as follows:— A man appears before a party seated: he bends, takes up a handful of earth or sand with his right hand, and throws a little into his left—the left hand rubs the sand or earth over the right elbow and the right side of the stomach, while the right hand performs the same operation for the left parts of the body, the mouth meanwhile uttering rapidly words of salutation. To his inferiors, however, the new-comer slaps his hand several times, and after each slap lightly taps the region of his heart.