One of the effects of witchcraft beliefs in Africa is the depopulation of that continent. Over enormous areas of the country the death rate has exceeded the birth rate. Much of Africa is desert--the Sahara of the north, and the Kalahari of the south--with estimated populations of only one to the square mile. Another large area is a wilderness covered by the great sub-equatorial forest,--a belt about three hundred miles wide and one thousand miles long, with an estimated population of only eighteen to the square mile (among whom are the Pygmy tribes); and these not scattered uniformly, but gathered chiefly on the banks of the watercourses, the only highways (except narrow footpaths) through that dismal forest. The entire population of Africa, including all nationalities,--Copts of Egypt, Moors and Berbers of the north, Arabs of the east, Abyssinians, Pygmies, and Cannibals of the centre, Negroes, both Bantu and Negroid, of the west, south, centre, and east,--probably do not number two hundred million. Of these, the Negroes probably do not amount to one hundred million. German authorities variously estimate the population of their Kamerun country at from two to five million, and they have been vigorously reducing it by their savage punitive expeditions in the interior. The French authorities of the Kongo-Français estimate theirs at from five to ten million. The population of the great Kongo River was much overestimated after the opening of that river by Stanley. Its people were massed on the river banks, and gave an impression of density which subsequent interior travel has not verified. To walk slowly in an hour over a mile of road that constitutes the one street of a town; to count the huts, and allot such or such a number to each, would give a sufficiently accurate census of one thousand or perhaps two thousand to that town. But that place is the centre of travel or traffic of that region. A half-day's journey on any radius from that town through the surrounding forest would confront the traveller with scarcely any other evidences of human habitation. Towns of the thousands are not the usual sight; rather the villages of one hundred, and the hamlets of twenty, excepting in the Sudan, in the Yoruba and other countries of the Niger, and in the large capitals of Dahomey and other Guinea kingdoms. There walled cities of from fifty to one hundred thousand inhabitants are known.