On the other hand, these privileges were counterbalanced by a corresponding diminution of the value at which his life and limbs were assessed. That a racial distinction underlay the difference in social position and standing is suggested by the current penalties for assault, in accordance with which a noble could demand an exact retaliation for injuries from one of his own class, whereas he merely paid a money compensation to any man of the middle class he might have injured. Thus if one noble happened to knock out the eye or the tooth of another, his own eye or his own tooth was knocked out in return, and if he broke the limb of one of the members of his own class, he had his corresponding limb broken; but, if he knocked out the eye of a member of the middle class, or broke his limb, he was fined one maneh of silver, and for knocking out the tooth of such a man, he was fined one-third of a maneh. Other regulations point to a similar cleavage in the social strata, which can best be explained by a difference in race. Thus if two members of the same class quarrelled and one of them made a peculiarly improper assault on the other, the assailant was only fined, the fine being larger if the quarrel was between two nobles. But if such an assault was made by a member of the middle class upon a noble, the assailant was punished by being publicly beaten in the presence of the assembly, when he received sixty stripes from an ox-hide scourge. The third and lowest class in the community were the slaves, who were owned by both the upper classes, but were naturally more numerous in the households of the nobles and on their estates. The slave was his master's absolute property, and on the contract-tablets he is often referred to as "a head," as though he were merely an animal. He constantly changed hands, by sale, bequest, or when temporarily pledged for a debt. For bad offences he was liable to severe punishment, such as cutting off the ear, which was the penalty for denying his master, or for making an aggravated assault upon a noble. But, on the whole, his lot was not a particularly hard one, for he was a recognized member of his master's household, and, as a valuable piece of property, it was obviously to his owner's interest to keep him healthy and in good condition. In fact, the value of the slave is attested by the severity of the penalties exacted for abducting a male or female slave from the owner's house and removing one from the city; for the death penalty was imposed in such a case, as also on anyone harbouring and taking possession of a runaway slave. On the other hand, a fixed reward was paid by the owner to anyone by whom a runaway was captured and brought back. Special legislation was also devised with the object of rendering the theft of slaves difficult and their detection easy. Thus, if a brander put a mark upon a slave without the owner's consent, he was liable to have his hands cut off; and, if he could prove that he