factories and in mines, and performed, in short, a considerable part of the productive labour in the state. A whole large section, then, of the producers in ancient Greece had no social or political rights at all. They existed simply to maintain the aristocracy of citizens, for whom and in whom the state had its being. Nor was this state of things in the least repugnant to the average Greek mind. Nothing is more curious to the modern man than the temper in which Aristotle approaches this theme. Without surprise or indignation, but in the tone of an impartial, scientific inquirer, he asks himself the question whether slavery is natural, and answers it in the affirmative. For, he argues, though in any particular case, owing to the uncertain chances of fortune and war, the wrong person may happen to be enslaved, yet, broadly speaking, the general truth remains, that there are some men so inferior to others that they ought to be despotically governed, by the same right and for the same good end that the body ought to be governed by the soul. Such men, he maintains, are slaves by nature; and it is as much to their interest to be ruled as it is to their masters' interest to rule them. To this class belong, for example, all who are naturally incapable of any but physical activity. These should be regarded as detachable limbs, so to speak, of the man who owns them, instruments of his will, like hands and feet; or, to use Aristotle's own phrase, "the slave is a tool with life in it, and the tool a lifeless slave." The relation between master and slave thus frankly conceived by the Greeks, did not necessarily imply, though it was quite compatible with, brutality of treatment. The slave might be badly treated, no doubt, and very frequently was, for his master had almost absolute control over him, life and limb; but, as we should expect, it was clearly recognised by the best Greeks that the treatment should be genial and humane. "There is a certain mutual profit and kindness," says Aristotle, "between master and slave, in all cases where the relation is natural, not merely imposed from without by convention or force." [Footnote: Arist. Pol. I. 7. 1255 b 12] And Plato insists on the duty of neither insulting nor outraging a slave, but treating him rather with even greater fairness than if he were in a position of equality.