THE work entitled "The Albert N'yanza Great Basin of the Nile," published in 1866, has given an account of the equatorial lake system from which the Egyptian river derives its source. It has been determined by the joint explorations of Speke, Grant, and myself, that the rainfall of the equatorial districts supplies two vast lakes, the Victoria and the Albert, of sufficient volume to support the Nile throughout its entire course of thirty degrees of latitude. Thus the parent stream, fed by never-failing reservoirs, supplied by the ten months' rainfall of the equator, rolls steadily on its way through arid sands and burning deserts until it reaches the Delta of Lower Egypt.It would at first sight appear that the discovery of the lake sources of the Nile had completely solved the mystery of ages, and that the fertility of Egypt depended upon the rainfall of the equator concentrated in the lakes Victoria and Albert; but the exploration of the Nile tributaries of Abyssinia divides the Nile system into two proportions, and unravels the entire mystery of the river, by assigning to each its due share in ministering to the prosperity of Egypt.