The original men who peopled the northern continents after the first glacial period were of small stature, agile, and well formed, with mild and pleasing countenance and heads of the medium (mesitocephalic) type. They were dwellers in a warm climate and subsisted on fruits. As population increased and men became hunters and fishermen, and wandered widely over the world, a large-boned, coarse-featured, and savage type of man arose, such as we find in the older caves and gravels, and weapons of kinds not needed in primitive times were invented. In this state of affairs, when the coarser and stronger races had made themselves masters of the world, and had perhaps partially intermixed with the older and more peaceful peoples, a great diluvial catastrophe occurred, which swept away the greater part of men. The survivors were of the old and unmodified stock, and it was they who repeopled the new world, finding possibly here and there some survivors of the former population, or themselves locally relapsing into a similar state. In this case all the seeming paradoxes and contradictions which have perplexed archæologists would be easily explained. We might even find occasional captives of the primitive small race among the interments of the old giants, and we might find new races of superior physical power arising in the new world and again intruding on the feebler race. In closing our notice of this period we may proceed to connect it with actual history in the British Islands. When the Romans invaded Britain they found in it two races of men physically very distinct, one of them the aborigines, who had made their way to the island as its first population after the close of the mammoth age, the others apparently a later intrusion. They are known to English antiquaries from their modes of burial as the men of the long and the round barrows or funeral mounds. The first of these are beyond doubt the kinsmen of our little men of the Trou de Frontal, in Belgium. They are thus described by Greenwell and Taylor[29]: [29] Greenwell, _British Barrows_; Taylor, _Origin of the Aryans_.