More and more numerous, it is true, the African linguistic studies give, however, nowadays, the impression of going constantly in circles, insofar as the African languages, old and modern, are apprehended, until now, only 'at the ethnographic level alone, according to an "a-temporal" synchronic logic. However, as early as 1925, the great French comparator Antoine Meillet had predicted that all the "Negro languages of Africa" were based on "the same original language". This book undoubtedly marks a decisive turning point in the African linguistic field. He demonstrates, with a completely sure methodology and an equally admirable mastery of the facts, that ancient Egyptian, Coptic and modern Negro-African languages have a common origin. Thus historical linguistics, barely sketched in black Africa, can indeed take birth and rise, on the African continent, from this reference work, the scientific scope of which honors, in truth, African research, and in fact, d evidence, an encyclopedia of general African linguistics.