This novel assertion is perfectly erroneous, and if it found adherents, it is simply because the question has been badly put; because the word _race_ has not received a precise signification, and consequently, a very confused acceptation has been given to the term. Among the various characters which distinguish the numerous varieties of the _genus homo_, some are more or less important, and more or less evident. To distinguish two races, a single character, however slight, is sufficient, provided it be hereditary and sufficiently fixed. If, for instance, two peoples differed merely from each other by the colour of the hair and the beard, though they may resemble each other in every other respect, by the simple fact that the one has black, whilst the other has fair hair, it may be asserted that they are not of the same race. This is the popular and the true meaning of the term race, which, however, does not necessarily implicate the idea either of identity or diversity of origin. Thus all ethnologists and historians, all the monogenists, and polygenistic authors say that the Irish proper are not of the same race as the English. The Germans, the Celts, the Basques, the Sclaves, the Jews, Arabs, Kabyles, etc., etc., are considered more or less separate races, more or less easy to be characterised, and more or less distinguished by their manners, tongues, history and origin. There are thus a large number of human races; but if, instead of considering all the characters, we confine ourselves to take into consideration but a few of the more important, or if, after having by an analytical process, first studied the various races separately, we now subject them to a synthetic process, we soon recognise that there exists among them numerous affinities, which enable us to dispose them in a certain number of natural groups. The ensemble of the characters common to each group, constitute the type of that group. Thus, all the races we have just enumerated, and many others, have the skin white, regular features, soft hair, oval face, vertical jaws, and elliptical cranium, etc. These points of resemblance give them in some sort a family likeness, by which they are recognised at once, and which has caused them to be designated by the collective name of Caucasian races. The hyperborean races, and those of Eastern Asia, constitute the family of Mongolian races; the group of Ethiopian races equally comprises a large number of black races with woolly hair, and a prognathous head. The American and the Malayo-Polynesian races form the two last groups.