of a state as community in pursuit of the good. He wishes to confine membership in it to those who are capable of that pursuit in the highest and most explicit manner. His citizens, therefore, must be men of leisure, capable of rational thought upon the end of life. He does not recognise the significance of that less conscious but deep-seated membership of the state which finds its expression in loyalty and patriotism. His definition of citizen includes only a small part of the populationof any Greek city. He is forced to admit that the state is not possible without the co-operation of men whom he will not admit to membership in it, either because they are not capable of sufficient rational appreciation of political ends, like the barbarians whom he thought were natural slaves, or because the leisure necessary for citizenship can only be gained by the work of the artisans who by that very work make themselves incapable of the life which they make possible for others. "The artisan only attains excellence
in proportion as he becomes a slave," and the slave is only a living instrument of the good life. He exists for the state, but the state does not exist for him.
2. Aristotle in his account of the ideal state seems to waver between two ideals. There is the ideal of an aristocracy and the ideal of what he calls constitutional government, a mixed constitution. The principle of "tools to those who can use them" ought to lead him, as it does Plato, to an aristocracy. Those who have complete knowledge of the good must be few, and therefore Plato gave entire power in his state into the hands of the small minority of philosopher guardians. It is in accordance with this principle that Aristotle holds that kingship is the proper form of government when there is in the state one man of transcendent virtue. At the same time, Aristotle always holds that absolute government is not properly political, that government is not like the rule of a shepherd over his sheep, but the rule of equals over equals. He admits that the democrats are right in insisting that equality is a necessary element in the state, though he thinks they do not admit the importance of other equally necessary elements. Hence he comes to
say that ruling and being ruled over by turns is an essential feature of constitutional government, which he admits as an alternative to aristocracy. The end of the state, which is to be the standard of the distribution of political power, is conceived sometimes as
a good for the apprehension and attainment of which "virtue" is necessary and sufficient (this is the principle of aristocracy), and sometimes as a more complex good, which needs for its attainment not only "virtue" but wealth and equality. This latter conception is the principle on which the mixed constitution is based. This in its distribution of political power gives some weight to "virtue," some to wealth, and some to mere number. But the principle of "ruling and being ruled by turns" is not really compatible with an unmodified principle of "tools to those who can use them." Aristotle is right in seeing that political government demands equality, not in the sense that all members of the state should be equal in ability or should have equal power, but in the sense that none of them can properly be regarded simply as tools with which the legislator works, that each has a right to say what will be made of his own life. The analogy between the legislator and the craftsman on which Plato insists, breaks down because the legislator is dealing with men like himself, men who can to some extent conceive their own end in life and cannot be treated merely as means to the end of the legislator. The sense of the value of "ruling and being ruled in turn" is derived from the experience that the ruler may use
his power to subordinate the lives of the citizens of the state not to the common good but to his own private purposes. In modern terms, it is a simple, rough-and-ready attempt to solve that constant problem of politics, how efficient government is to be combined with popular control. This problem arises from the imperfection of human nature, apparent in rulers as well as in ruled, and if the principle which attempts to solve it be admitted as a principle of importance in the formation of the best constitution, then the starting-point of politics will be man's actual imperfection, not his ideal nature. Instead, then, of beginning with a state which would express man's ideal nature, and adapting it as well as may be to man's actual shortcomings from that ideal, we must recognise that the state and all political machinery are as much the expression of man's weakness as of his ideal possibilities. The state is possible only because men have common aspirations, but government, and political power, the existence of officials who are given authority to
act in the name of the whole state, are necessary because men's community is imperfect, because man's social nature expresses itself in conflicting ways, in the clash of interests, the rivalry of parties, and the struggle of classes, instead of in the united seeking after a common good. Plato and Aristotle were familiar with the legislator who was called in by the whole people, and they tended therefore to take the general will or common consent of the people for granted. Most political questions are concerned with the construction and expression of the general will, and with attempts to ensure that the political machinery made to express the general will shall not be exploited for private or sectional ends.
Aristotle's mixed constitution springs from a recognition of sectional interests in the state. For the proper relation between the claims of "virtue," wealth, and numbers is to be based not upon their relative importance in the good life, but upon the strength of the parties which they represent. The mixed constitution is practicable in a state where the middle class is strong, as only the middle class can mediate between the rich and the poor. The mixed constitution will be stable if it represents the actual balance of power between different classes in the state. When we come to Aristotle's analysis of existing constitutions, we find that while he regards them as imperfect approximations to the ideal, he also thinks of them as the result of the struggle between classes. Democracy, he explains, is the government not of the many but of the poor; oligarchy a government not of the few but of the rich. And each class is thought of, not as trying to express an ideal, but as struggling to acquire power or maintain its position. If ever the class existed
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in unredeemed nakedness, it was in the Greek cities of the fourth century, and its existence is abundantly recognised by Aristotle. His account of the causes of revolutions in Book V. shows how far were the existing states of Greece from the ideal with which he starts. His analysis of the facts forces him to look upon them as the scene of struggling factions. The causes of revolutions are not described as primarily changes in the conception of the common good, but changes in the military or economic power of the several classes in the state. The aim which he sets before oligarchs or democracies is not the good life, but simple stability or permanence of the existing constitution.
With this spirit of realism which pervades Books IV., V., and VI. the idealism of Books I., II., VII., and VIII. is never reconciled. Aristotle is content to call existing constitutions perversions of the true form. But we cannot read the Politics without recognising and profiting from the insight into the nature of the state which is revealed throughout. Aristotle's failure does not lie in this, that he is both idealist and realist, but that he keeps these two tendencies too far apart. He thinks too much of his ideal state, as something to be reached once for all by knowledge, as a fixed type to which actual states approximate or from which they are perversions. But
if we are to think of actual politics as intelligible in the light of the ideal, we must think of that ideal as progressively revealed in history, not as something to be discovered by turning our back on experience and having recourse to abstract reasoning. If we stretch forward from what exists to an ideal, it is to a better which may be in its turn transcended, not to a single immutable best. Aristotle found in the society of his time men who were not capable of political reflection, and who, as he thought, did their best work under superintendence. He therefore called them natural slaves. For, according to Aristotle, that is a man's natural condition in which he does his best work. But Aristotle also thinks of nature as something fixed and immutable; and therefore sanctions the institution of slavery, which assumes that what men are that they will always be, and sets up an artificial barrier to their ever becoming anything else. We see in Aristotle's defence of slavery how the conception of nature as the ideal can have a debasing influence upon views
of practical politics. His
