THE COMMONS 57 termed—of the vill. No completely satisfactory interpretation of their early history has yet been formulated; but, whatever may be the tangled legal theory that lies behind them, we may begin by» noting that "right of common" was vital to the villager. He relied on pasture to keep his plough beasts in good condition, and therefore "common of pasture" was what he most tena- ciously clung to. This was not an unlimited right, but was con- trolled by the number of acres he held in the common fields; and further, only those who had cattle levant e couchant en le maner could claim even this limited use. And since the whole object of common was to support and sustain the manorial agri- cultural routine only those animals thus directly engaged were " commonable ", viz. horses and oxen for the plough, and sheep and cows for manuring. Other common rights, apparently of later date, treated by some writers as "common appurtenant", allowed the villager to pasture his goats, swine and geese on the waste, and were extended so as to include those who had no holding in the common fields, but had only a close or an assart which they held of the lord. The gradual assarting of land, as we have seen, meant the enclosure of pieces of the waste for the individual use of some one person, and this obviously meant that there was that much land less for the common use of the vill. Now as long as the waste was large, and not overcharged