In the sense that no race now exists which is not in some degree touched by the influence of Western civilization, the present decade may be said to be a fresh starting-point in the history of mankind. Whithersoever we turn, the laws of custom, which have governed the uncivilized races for countless generations, are breaking down; the old isolation which kept their blood pure is vanishing before railway and steamship communication which imports alien labourers to work for European settlers; and ethnologists of the future, having no pure race left to examine, will have to fall back upon hearsay evidence in studying the history of human institutions. All this has happened before in the world's history, but in a more limited area. To the Roman armies, the Roman system of slave-owning, and still more to the Roman roads, we owe the fact that there is not in Western Europe a single race of unmixed blood, for even the Basques, if they are indeed the last survivors of the old Iberian stock, have intermarried with the French and Spanish people about them. An ethnologist of the eighth century, meditating on the wave upon wave of destructive immigration that submerged England, might well have doubted whether so extraordinary a mixture of races could ever develop patriotism and pride of race, and yet it did not take many centuries to evolve in the English a sense of nationality with insular prejudice superadded. Nationality and patriotism are in fact purely artificial and geographical sentiments. We feel none of the bitter hate of our Saxon forefathers for their Norman conquerors; the path of our advance through the centuries is strewn with the corpses of patriotisms and race hatreds. Nor was the mixture of races in Europe the mere mingling of peoples descended from a common Aryan stock, for if that were so, what has become of the Persians and Egyptians, worshippers of Æon and Serapis and Mithras, who garrisoned the Northumberland wall; of the host of Asiatic and African soldiers and slaves scattered through Europe during the Roman Empire; of the Negroes introduced into southern Portugal by Prince Henry the Navigator; of the Jews that swarmed in every medieval city; of the Moors in southern Spain? Did none of these intermarry with Aryans, and leave a half-caste Semitic or Negro or Tartar progeny behind them? How otherwise can one account for the extraordinary diversity in skull measurement, in proportion and in colour which is found in the population of every European country?