This system, this economic side of feudalism, is what we know as the manorial system. Its unit was the manor, an estate of land larger or smaller, but large enough to admit of this characteristic organization, managed as a unit, usually from some well-defined centre, the manor house, and directed by a single responsible head, the lord's steward. The land which constituted the manor was divided into two clearly distinguished parts, the "domain" and the "tenures." The domain was the part of each manor that was reserved for the lord's own use, and cultivated for him by the labour of his tenants under the direction of the steward, as a part of the services by which they held their lands; that is, as a part of the rent paid for them. The returns from these domain lands formed a very large part, probably the largest part, of the income of the landlord class in feudal days. The "tenures" were the holdings of the cultivators, worked for themselves by their own labour, of varying sizes and held on terms of varying advantage, and usually scattered about the manor in small strips, a bit here and another there. Besides these cultivated lands there were also, in the typical manor, common pasture lands and common wood lands, in which the rights of each member of this little community were carefully regulated by the customary law of the manor. This whole arrangement was plainly economic in character and purpose it was not in the least political. Its object was to get the soil cultivated, to provide mankind with the necessary food and clothing, and the more fortunate members of the race with their incomes. This purpose it admirably served in an age when local protection was an ever present need, when the labouring man had often to look to the rich and strong man of the neighbourhood for the security which he could not get from the state. Whatever may have been the origin of this system, it was at any rate this need which perpetuated it for centuries from the fall of Rome to the later Middle Ages; and during this long time it was by this system that the western world was fed and all its activities sustained.