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 these different forms, their respective merits and disadvantages, and the practical means for obviating the evils to which they are respectively exposed. Greek society was very unstable; Athens and many other cities were, like Paris during the last half-century, in chronic expectation of a revolution. Therefore a theory of seditions and revolutions became an essential part of Greek political science, and Aristotle furnishes one accordingly, containing the wise remark that “small things are never the cause, though they are often the occasion, of popular revolt.” He shows that there are three normal forms of government,—the Monarchy, or government by one wise ruler; the Aristocracy, or government by a select number of the wisest and best; and the “Constitution,” or mixed government, in which democratic, monarchic, and aristocratical elements are balanced against each other. Each of these normal and perfect forms, wherever they have existed, has followed a tendency to diverge into a corruption of itself;—the monarchy degenerates into Tyranny, the aristocracy into Oligarchy, and the “Constitution” into Democracy. These lower forms are the kinds of government which Aristotle practically finds in the world. He shows how each of them is constantly menaced by revolution, and from what special causes, namely, the peculiar jealousies which each is apt to engender. He says that it is not the desire of gain, so much as tenacity of rights or fancied rights, that causes revolution. He gives various pieces of advice to those who administer the different forms of government;—one of which is that each government should avoid