The word _race_ has thus, in the language of authors, two very different significations; one is particular and exact, the other general and misleading. Taken in the first sense, it designates individuals sufficiently resembling each other, that we may, without prejudging their origin, and without deciding whether they are the issues of one or several primitive couples, admit, if necessary, as theoretically possible, that they have descended from common parents. Such are, for instance, among the white races, the Arabs, the Basques, the Celts, the Kimris, the Germans, the Berbers, etc.; and among the black races, the Ethiopian Negroes, the Caffres, the Tasmanians, Australians, Papuans, etc. In the second, that is to say, in a general sense, the term race designates the _ensemble_ of all such individuals who have a certain number of characters in common, and who, though differing in other characters, and divided, perhaps, in an indefinite number of natural groups or races, have to each other a greater morphological affinity than they have with the rest of mankind. Every confusion in words exposes us to errors in the interpretation of facts, and this rather long digression in relation to the origin of a denomination, borrowed by certain polygenists from the language of monogenists, enables us to understand the denial of the existence of mixed races, and why Prichard could only oppose to this idea the doubtful and fictitious examples of the Cafusos, the Griquas, and the mop-headed Papuans. If, indeed, it were true that there are only five races of men on the globe, and if it were capable of demonstration that either of them, in mixing with another, produced eugenesic Mulattos capable of constituting a mixed race enduring by itself, without the ulterior concurrence of the parent races, the embarrassment would not yet be at an end. After having succeeded to establish such a demonstration for two of the chief races, it would by no means necessarily result that the intercrossings of the nine other combinations are eugenesic like the first. We should then be obliged to prove (what is evidently impracticable), by ten successive examples, that the ten possible intercrossings between the five fundamental races are all equally and completely prolific. The difficulty is such, that Dr. Prichard, after much research, could only find the three instances already cited and refuted. These facts having proved inconclusive, and other facts which we shall mention presently having induced the theory that _certain_ intermixtures are imperfectly prolific, the pentagenists were led to the opinion that the possibility of a definitive intermixture of races is by no means established, and that, on the contrary, this possibility may be denied.