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.

The lake sources of Central Africa support the life of Egypt, by
supplying a stream, throughout all seasons, that has sufficient
volume to support the exhaustion of evaporation and absorption;
but this stream, if unaided, could never overflow its banks, and
Egypt, thus deprived of the annual inundation, would simply
exist, and cultivation would be confined to the close vicinity of
the river.

The inundation, which by its annual deposit of mud has actually
created the Delta of Lower Egypt, upon the overflow of which the
fertility of Egypt depends, has an origin entirely separate from
the lake-sources of Central Africa, and the supply of water is
derived exclusively from Abyssinia.