_28th June, 1869._--The current in Tanganyika is well marked when the lighter-coloured water of a river flows in and does not at once mix--the Luishé at Ujiji is a good example, and it shows by large light greenish patches on the surface a current of nearly a mile an hour north. It begins to flow about February, and continues running north till November or December. Evaporation on 300 miles of the south is then at its strongest, and water begins to flow gently south till arrested by the flood of the great rains there, which takes place in February and March. There is, it seems, a reflux for about three months in each year, flow and reflow being the effect of the rains and evaporation on a lacustrine river of some three hundred miles in length lying south of the equator. The flow northwards I have myself observed, that again southwards rests on native testimony, and it was elicited from the Arabs by pointing out the northern current: they attributed the southern current to the effect of the wind, which they say then blows south. Being cooled by the rains, it comes south into the hot valley of this great Riverein Lake, or lacustrine river. In going to Moenékuss, the paramount chief of the Manyuema, forty days are required. The headmen of trading parties remain with this chief (who is said by all to be a very good man), and send their people out in all directions to trade. Moenemogaia says that in going due north from Moenékuss they come to a large river, the Robumba, which flows into and is the Luama, and that this again joins the Lualaba, which retains its name after flowing with the Lufira and Lofu into the still unvisited Lake S.S.W. of this: it goes thence due north, probably into Mr. Baker's part of the eastern branch of the Nile. When I have gone as far north along Lualaba as I can this year, I shall be able to judge as to the course I ought to take after receiving my goods and men from Zanzibar, and may the Highest direct me, so that I may finish creditably the work I have undertaken. I propose to start for Manyuema on the 3rd July. The dagala or nsipé, a small fish caught in great numbers in every flowing water, and very like whitebait, is said to emit its eggs by the mouth, and these immediately burst and the young fish manages for itself. The dagala never becomes larger than two or three inches in length. Some, putrefied, are bitter, as if the bile were in them in a good quantity. I have eaten them in Lunda of a pungent bitter taste, probably arising from the food on which the fish feeds. Men say that they have seen the eggs kept in the sides of the mouth till ready to go off as independent fishes. The nghédé-dégé, a species of perch, and another, the ndusi, are said to do the same. The Arabs imagine that fish in general fall from the skies, but they except the shark, because they can see the young when it is cut open.