Great interest has been awakened in the geographical discoveries that have been made in Central Equatorial Africa during the last twenty-five years. This vast and newly-explored country is no doubt the choicest portion of the whole African continent. The inhabitants, with the exception of a few mixed tribes along its outer borders, all belong to one great family. A line starting from the Cameroon Mountains on the western coast, second degree north latitude, and drawn, with some slight variations, directly across the continent to the same degree of latitude on the east coast, divides the negro race into two distinct families, perhaps of nearly equal size. The one, occupying the country north of this line to the southern borders of the Great Desert, is known as the Nigritian stock, from the fact that they are to be found mainly in the valley of the Niger. The other, and the one to which our article mainly refers, is known as the Ethiopian or Nilotic family, from its supposed descent from the ancient Ethiopians, whose chief residence was the banks of the Nile. One general language, with great divergence as to dialects, prevails over this whole region of country. There are not only verbal resemblances, but there is a peculiar grammatical structure, scarcely known to any other language, that pervades and characterizes all the dialects of this one great family. A very large number of words are common to the Mpongwe dialect on the west coast, and the Swahili on the east, as may be seen from a grammar of the Mpongwe, published by the missionaries at the Gaboon years ago. If the words used by three or four tribes along the coast of Southern Guinea could be fully collated, they would be found to contain not less, perhaps, than four-fifths of all the words used over the whole of this vast region.