The Wealth of Nations by Part 3 Chapter 2 Page 13

wife to different persons. If he maimed or murdered any of them, he was liable to some penalty, though generally but to a small one. They were not, however, capable of acquiring property. Whatever they acquired was acquired to their master, and he could take it from them at pleasure.

Whatever cultivation and improvement could be carried on by means of such slaves was properly carried on by their master. It was at his expense. The seed, the cattle, and the instruments of husbandry were all his. It was for his benefit. Such slaves could acquire nothing but their daily maintenance. It was properly the proprietor himself, therefore, that, in this case, occupied his own lands, and cultivated them by his own bondmen. This species of slavery still subsists in Russia, Poland, Hungary, Bohemia, Moravia, and other parts of Germany.