Having thus explained his position by this extreme instance, signified for the sake of clearness, Taine goes on to apply such general considerations to four historic epochs, taken in all their complexity. He discusses the aspect presented by art in ancient Greece, in the feudal and Catholic Middle Ages, in the centralized monarchies of the seventeenth century, and in the scientific, industrial democracy in which we now live. Out of these we shall select, as perhaps the simplest, the case of ancient Greece, still following our author closely, though necessarily omitting many interesting details. The ancient Greeks, observes Taine, understood life in a new and original manner. Their energies were neither absorbed by a great religious conception, as in the case of the Hindus and Egyptians, nor by a vast social organization, as in the case of the Assyrians and Persians, nor by a purely industrial and commercial regime, as in the case of the Phoenicians and Carthaginians. Instead of a theocracy or a rigid system of castes, instead of a monarchy with a hierarchy of civil officials, the men of this race invented a peculiar institution, the City, each city giving rise to others like itself, and from colony to colony reproducing itself indefinitely. A single Greek city, for instance, Miletos, produced three hundred other cities, colonizing with them the entire coast of the Black Sea. Each city was substantially self-ruling; and the idea of a coalescence of several cities into a nation was one which the Greek mind rarely conceived, and never was able to put into operation. In these cities, labour was for the most part carried on by slaves. In Athens there were four or five for each citizen, and in places like Korinth and Aigina the slave population is said to have numbered four or five hundred thousand. Besides, the Greek citizen had little need of personal service. He lived out of doors, and, like most Southern people, was comparatively abstemious in his habits. His dinners were slight, his clothing was simple, his house was scantily furnished, being intended chiefly for a den to sleep in.