How surely do those tropic lands avenge themselves on each new savage horde of invaders from the hardy North. It is not done in a generation, not in a century, perhaps. But drop by drop the vigorous, tingling, Arctic blood is sapped away. Year after year the lazy comfort, the loose pleasure, of the south land fastens its curse upon the mighty warriors. As we watch the Persians, we see their kings go mad, or become effeminate tyrants sending underlings to do their fighting for them. We see the whole race visibly degenerate, until one questions if Marathon[12] were after all so marvellous a victory, and suspects that at whatever point the Persians had begun their advance on Europe they would have been easily hurled back. [Footnote 12: See _The Battle of Marathon_, page 322.] It was in Europe only that the Aryan wanderers found a temperate climate, a region similar to that in which they had been bred. Recent speculation has even suggested that Europe was their primeval home, from which they had strayed toward Asia, and to which they now returned. Certainly it is in Europe that the race has continued to develop. Earliest of these Aryan waves to take possession of their modern heritage, were the Celts, who must have journeyed over the European continent at some dim period too remote even for a guess. Then came the Greeks and Latins, closely allied tribes, representing possibly a single migration, that spread westward along the islands and peninsulas of the Mediterranean. The Teutons may have left Asia before B.C. 1000, for they seem to have reached their German forests by three centuries beyond that time, and these vast migratory movements were very slow. The latest Aryan wave, that of the Slavs, came well within historic times. We almost fancy we can see its movement. Russian statesmen, indeed, have hopes that this is not yet completed. They dream that they, the youngest of the peoples, are yet to dominate the whole. THE GREEKS AND LATINS Of these European Aryans the only branches that come within the limits of our present period, that become noteworthy before B.C. 480, are the Greeks and Latins. Their languages tell us that they formed but a single tribe long after they became separated from the other peoples of their race. Finally, however, the Latins, journeying onward, lost sight of their friends, and it must have taken many centuries of separation for the two tongues to grow so different as they were when Greeks and Romans, each risen to a mighty nation, met again. The Greeks, or Hellenes as they called themselves, seem to have been only one of a number of kindred tribes who occupied not only the shores of the AEgean, but Thrace, Macedonia, a considerable part of Asia Minor, and other neighboring regions. The Greeks developed in intellect more rapidly than their neighbors, outdistanced them in the race for civilization, forgot these poor relations, and grouped them with the rest of outside mankind under the scornful name "barbarians."