To begin with, we must dismiss the idea that Celtica was ever inhabited by a single pure and homogeneous race. The true Celts, if we accept on this point the carefully studied and elaborately argued conclusion of Dr. T. Rice Holmes, supported by the unanimous voice of antiquity, were a tall, fair race, warlike and masterful, whose place of origin (as far as we can trace them) was somewhere about the sources of the Danube, and who spread their dominion both by conquest and by peaceful infiltration over Mid-Europe, Gaul, Spain, and the British Islands. They did not exterminate the original prehistoric inhabitants of these regions—palæolithic and neolithic races, dolmen-builders and workers in bronze—but they imposed on them their language, their arts, and their traditions, taking, no doubt, a good deal from them in return, especially, as we shall see, in the important matter of religion. Among these races the true Celts formed an aristocratic and ruling caste. In that capacity they stood, alike in Gaul, in Spain, in Britain, and in Ireland, in the forefront or armed opposition to foreign invasion. They bore the worst brunt of war, of confiscations, and of banishment. They never lacked valour, but they were not strong enough or united enough to prevail, and they perished in far greater proportion than the earlier populations whom they had themselves subjugated. But they disappeared also by mingling their blood with these inhabitants, whom they impregnated with many of their own noble and virile qualities. Hence it comes that the characteristics of the peoples called Celtic in the present day, and who carry on the Celtic tradition and language, are in some respects so different from those of the Celts of classical history and the Celts who produced the literature and art of ancient Ireland, and in others so strikingly similar. To take a physical characteristic alone, the more Celtic districts of the British Islands are at present marked by darkness of complexion, hair, &c. They are not very dark, but they are darker than the rest of the kingdom. But the true Celts were certainly fair. Even the Irish Celts of the twelfth century are described by Giraldus Cambrensis as a fair race.