The political institutions of the Platonic state are decidedly aristocratic. Grown up in opposition to the extravagances of the Athenian democracy, Plato prefers an absolute monarchy to every other constitution, though this should have as its absolute ruler only the perfect philosopher. It is a well-known expression of his, that the state can only attain its end when philosophers become its rulers, or when its present rulers have carried their studies so far and so accurately, that they can unite philosophy with a superintendence of public affairs (V. 473). His reason for claiming that the sovereign power should be vested only in one, is the fact that very few are endowed with political wisdom. This ideal of an absolute ruler who should be able to lead the state perfectly, Plato abandons in the _Laws_, in which work he shows his preference for a mixed constitution, embracing both a monarchical and an aristocratic element. From the aristocratic tendency of the Platonic ideal of a state, follows farther the sharp division of ranks, and the total exclusion of the third rank from a proper political life. In reality Plato makes but two classes in his state, the subjects and the sovereign, analogous to his twofold psychological division of sensible and intellectual, mortal and immortal, but as in psychology he had introduced a middle step, spirit, to stand between his two divisions there, so in the state he brings in the military class between the ruler and those intended to supply the bodily wants of the community. We have thus three ranks, that of the ruler, corresponding to the reason, that of the watcher or warrior, answering to spirit, and that of the craftsman, which is made parallel to the appetites or sensuous desires. To these three ranks belong three separate functions: to the first, that of making the law and caring for the general good; to the second, that of defending the public welfare from attacks of external foes; and to the third, the care of separate interests and wants, as agriculture, mechanics, &c. From each of these three ranks and its functions the state derives a peculiar virtue—wisdom from the ruler, bravery from the warrior, and temperance from the craftsman, so far as he lives in obedience to his rulers. In the proper union of these three virtues is found the justice of the state, a virtue which is thus the sum of all other virtues. Plato pays little attention to the lowest rank, that of the craftsman, who exists in the state only as means. He held that it was not necessary to give laws and care for the rights of this portion of the community. The separation between the ruler and the warrior is not so broad. Plato suffers these two ranks to interpenetrate each other, and analogous to his original psychological division, as though the reason were but spirit in the highest step of its development, he makes the oldest and the best of the warriors rise to the dignity and power of the rulers. The education of its warriors