Consider this passage of Plutarch, speaking of the elder Cato:—“He had a great number of slaves, whom he took care to buy at the sales of prisoners of war; and he chose them young, that they might easily be accustomed to any diet or manner of life, and be instructed in any business or labour, as men teach anything to young dogs or horses. And esteeming love the chief source of all disorders, he allowed the male slaves to have a commerce with the female in his family, upon paying a certain sum for this privilege; but he strictly forbade all intrigues out of his family.” Are there any symptoms in this narration of that care which is supposed in the ancients, of the marriage and propagation of their slaves? If that was a common practice, founded on general interest, it would surely have been embraced by Cato, who was a great economist, and lived in times when the ancient frugality and simplicity of manners were still in credit and reputation. It is expressly remarked by the writers of the Roman law that scarce any ever purchase slaves with a view of breeding from them.​[51] Our lackeys and housemaids, I own, do not serve much to multiply their species; but the ancients, besides those who attended on their person, had all their labour performed by slaves, who lived, many of them, in their family; and some great men possessed to the number of 10,000. If there be any suspicion, therefore, that this institution was unfavourable to propagation (and the same reason, at least in part, holds with regard to ancient slaves as well as modern servants), how destructive must slavery have proved! History mentions a Roman nobleman who had 400 slaves under the same roof with him; and having been assassinated at home by the furious revenge of one of them, the law was executed with rigour, and all without exception were put to death. Many other Roman noblemen had families equally, or more numerous, and I believe every one will allow that this would scarcely be practicable were we to suppose all the slaves married and the females to be breeders.​[52] So early as the poet Hesiod married slaves, whether male or female, were esteemed very inconvenient. How much more where families had increased to such an enormous size, as in Rome, and where simplicity of manners was banished from all ranks of people? Xenophon in his _Economics_, where he gives directions for the management of a farm, recommends a strict care and attention of laying the male and the female slaves at a distance from each other. He seems not to suppose that they are ever married. The only slaves among the Greeks that appear to have continued their own breed were the Helotes, who had houses apart, and were more the slaves of the public than of individuals.