§147. In some of these tasks intelligence and skill were required as they are to-day, but in many of them the most necessary qualifications were strength and endurance, as the slaves took the place of much of the machinery of modern times. This was especially true of the men employed in the quarries, who were usually of the rudest and most ungovernable class, and were worked in chains by day and housed in dungeons by night, as convicts have been housed and worked in much later times. §148. The Vilicus.--The management of such an estate was also intrusted to a _vīlicus_ (§145), who was proverbially a hard taskmaster, simply because his hopes of freedom depended upon the amount of profits he could turn into his master's coffers at the end of the year. His task was no easy one. Besides planning for and overseeing the gangs of slaves already mentioned, he had under his charge another body of slaves only less numerous, employed in providing for the wants of the others. Everything necessary for the farm was produced or manufactured on the farm. Enough grain was raised for food, and this grain was ground in the farm mills and baked in the farm ovens by millers and bakers who were slaves on the farm. The task of turning the mill was usually given to a horse or mule, but slaves were often made to do the grinding as a punishment. Wool was carded, spun, and woven into cloth, and this cloth was made into clothes by the female slaves under the eye of the steward's consort, the _vīlica_. Buildings were erected, and the tools and implements necessary for the work of the farm were made and repaired. These things required a number of carpenters, smiths, and masons, though they were not necessarily workmen of the highest class. It was the touchstone of a good _vīlicus_ to keep his men always busy, and it is to be understood that the slaves were alternately plowmen and reapers, vinedressers and treaders of the grapes, perhaps even quarrymen and lumbermen, according to the season of the year and the place of their toiling.