need only be pointed out that the withdrawal of land from cultivation was under way because tillage was unprofitable. If tillage was unprofitable in the fourteenth century, so unprofitable that heirs were anxious to buy themselves free of the obligation to enter upon their inheritance, while established landholders deserted their tenements, the enclosure of arable land for pasture in the fifteenth century is seen in a new light. When there was no question of desiring the land for sheep pasture, it was voluntarily abandoned by cultivators. Displacement of tillage due to an internal cause precedes displacement of tillage for sheep pasture. The process of withdrawing land from cultivation began independently of the scarcity of labor caused by the Black Death and independently of any change in the price of wool; the continuation of this process in the fifteenth century is not likely to depend entirely upon a rise in the price of wool. That the enclosures of the fifteenth century were in reality merely a further step in the readjustments under way in the fourteenth century cannot be doubted. And that the whole process was independent of the especial external influence upon agriculture exerted in the fourteenth century by the Black Death and in the fifteenth and sixteenth centuries by the growth of the woollen industry is shown in the case of a group of manors where the essential features of the enclosure movement appeared in the thirteenth century. More than a hundred years before the Black Death the Lord of Berkeley found it impossible to obtain tenants for bond land at the accustomed rents. Villains were giving up their holdings because they could not pay the rent and perform the services. The land which had in earlier times been sufficient for the maintenance of a villain and his family and had produced a surplus for rent had lost its fertility, and the holdings fell vacant. The land which reverted to the lord on this account was split up and leased at nominal rents, when leaseholders could be found, just as so much land was leased at reduced rents by landowners generally in the fourteenth century. Moreover, some of the land was unfit for cultivation at all and was converted to pasture under the direction of the lord.[13]