History has familiarised us with the idea of sovereign and subject races. The monuments of Egypt perpetuate the fact from its remote dawn, Punic, Roman, Gothic, Frank, Saracenic, and Scandinavian races, have in turn subdued others, and made them subservient to their will. Evidence of a different kind, but little less definite, points to the intrusion into Europe in prehistoric times of races superior alike in physical type, and in the arts upon which progress depends, to the Autochthones, or primitive occupants of the soil. Further indications have been assumed to point to the contemporaneous presence, in primeval Britain, as elsewhere, of races of diverse type, and apparently in the relation of lord and serf: a natural if not indeed inevitable consequence of the intrusion of a superior race of conquerors. But in the New World the inaptitude of the native race for useful serfdom largely contributed to the introduction there of other and very diverse races from Africa and Asia; so that now within a well-defined North American area, indigenous populations of the three continents of the Old World are displacing its native races. Still more, all three meet there under circumstances which inevitably lead to their intermixture with one another, and with the native races. Various terms, such as Iberian, Silurian, Canstadt, Cimbric, Finnish, and Turanian, have been applied to primitive types as expressive of the hypothesis of their origin. But on turning to the American continent we see vast regions occupied exclusively until a comparatively recent period by tribes of savage hunters, upon whom some of the most civilised races of Europe have intruded, with results in many respects so strikingly accordant with the supposed evolution of the Melanochroi of the Old World, that we seem to look upon a series of ethnological experiments prolonged through centuries, with synthetic results to a large extent confirmatory of previous inductions. The intermingling of very diverse races at present taking place on the American continent includes some of widely diverse types. There is seen the Portuguese in Brazil; the Spaniard in Peru, Mexico, Central America, and in Cuba; the African in the West Indies and the Southern States; the Chinese on the Pacific; the Frenchman on the St. Lawrence; the German, the Italian, the Norwegian, the Icelander, the Celt, and the Anglo-Saxon: all subjected to novel influences, necessarily testing the results of a change of climate, of diet, and of social habits, on the ethnical character of each. There too, alike in the Red and the Black races, we can study the results of hybridity carried out on a scale adequate to determine many important points calculated to throw light on the origin and perpetuation of diverse races of mankind.