We have seen that there was no considerable infiltration of barbarian blood, no “invasions” in our modern sense of the term—(or rather, no successful ones); no blotting out of civilization, still less any introduction of new institutions or ideas drawn from barbarism. The coast regions of Eastern Britain (the strongest example of all, for there the change was most severe) were reconquered for civilization and for the Faith by the efforts of St. Augustine; Africa was recaptured for the direct rule of the Emperor: so was Italy and the South of Spain. At the end of the seventh century that which was in the future to be called Christendom (and which is nothing more than the Roman Empire continuing though transformed) is again reunited. What followed was a whole series of generations in which the forms of civilization were set and crystallized in a few very simple, traditional and easily appreciated types. The whole standard of Europe was lowered to the level of its fundamentals, as it were. The primary arts upon which we depend for our food and drink, and raiment and shelter survived intact. The secondary arts reposing upon these, failed and disappeared almost in proportion to their distance from fundamental necessities of our race. History became no more than a simple chronicle. Letters, in the finer sense, almost ceased. Four hundred years more were to pass before Europe was to reawaken from this sort of sleep into which her spirit had retreated, and the passage from the full civilization of Rome through this period of simple and sometimes barbarous things, is properly called the Dark Ages. It is of great importance for anyone who would comprehend the general story of Europe, to grasp the nature of those half-hidden centuries. They may be compared to a lake into which the activities of the old world flowed and stirred and then were still, and from which in good time the activities of the Middle Ages, properly so called, were again to flow. Again one may compare the Dark Ages to the leafsoil of a forest. They are formed by the disintegration of an antique florescence. They are the bed from which new florescence shall spring. It is a curious phenomenon to consider: this hibernation, or sleep: this rest of the stuff of Europe. It leads one to consider the flux and reflux of civilization as something much more comparable to a pulse than to a growth. It makes us remember that _rhythm_ which is observed in all forms of energy. It makes us doubt that mere progress from simplicity to complexity which used to be affirmed as the main law of history. The contemplation of the Dark Ages affords a powerful criticism of that superficial theory of social evolution which is among the intellectual plagues of our own generation. Much more is the story of Europe like the waking and the sleeping of a mature man, than like any indefinite increase in the aptitudes and powers of a growing body.