An extremely old and often misleading metaphor will help us. People have said: 'The world was young then.' Of course, strictly speaking, it was not. In the total age of the world or of man the two thousand odd years between us and Pericles do not count for much. Nor can we imagine that a man of sixty felt any more juvenile in the fifth century B. C. than he does now. It was just the other way, because at that time there were no spectacles or false teeth. Yet in a sense the world _was_ young then, at any rate our western world, the world of progress and humanity. For the beginnings of nearly all the great things that progressive minds now care for were then being laid in Greece. Youth, perhaps, is not exactly the right word. There are certain plants--some kinds of aloe, for instance--which continue for an indefinite number of years in a slow routine of ordinary life close to the ground, and then suddenly, when they have stored enough vital force, grow ten feet high and burst into flower, after which, no doubt, they die or show signs of exhaustion. Apart from the dying, it seems as if something like that happened from time to time to the human race, or to such parts of it as really bear flowers at all. For most races and nations during the most of their life are not progressive but simply stagnant, sometimes just managing to preserve their standard customs, sometimes slipping back to the slough. That is why history has nothing to say about them. The history of the world consists mostly in the memory of those ages, quite few in number, in which some part of the world has risen above itself and burst into flower or fruit. We ourselves happen to live in the midst or possibly in the close of one such period. More change has probably taken place in daily life, in ideas, and in the general aspect of the earth during the last century than during any four other centuries since the Christian era: and this fact has tended to make us look on rapid progress as a normal condition of the human race, which it never has been. And another such period of bloom, a bloom comparatively short in time and narrow in area, but amazingly swift and intense, occurred in the lower parts of the Balkan peninsula from about the sixth to the fourth centuries before Christ.