tive part of the soul is the cause of desire of eating, sexual indulgence and the like, while the irascible part is the cause of courage, of pleasure and pain, and of anger. Thus one part of the soul is rational, another appetitive, and a third irascible. Of perfect virtue there are four species: prudence, justice, bravery and temperance. Of these prudence is the cause of right conduct, justice of just dealing in partnerships and commercial transactions. Bravery is the cause which makes a man not give way but stand his ground in alarms and perils. Temperance causes mastery over desires, so that we are never enslaved by any pleasure, but lead an orderly life. Thus virtue includes first prudence, next justice, thirdly bravery, and lastly temperance. Rule has five divisions, one that which is according to law, another according to nature, another according to custom, a fourth by birth, a fifth by force. Now the magistrates in cities when elected by their fellow-citizens rule according to law. The natural rulers are the males, not only among men, but also among the other animals; for the males everywhere exert wide-reaching rule over the females. Rule according to custom is such authority as attendants exercise over children and teachers over their pupils. Hereditary rule is exemplified by that of the Lacedaemonian kings, for the office of king is confined to a certain family. And the same system is in force for the kingdom of Macedonia ; for there too the office of king goes by birth. Others have