As the common of pasture appears as an outcome of a system of husbandry set up by the village community, so every change in the use of the pasture ought in the natural course to proceed from a decision of this community. Such a change may be effected in one of two manners: the customary rotation of crops may be altered, or else a part of the waste may be reclaimed for tillage. In the first case, a portion of the open arable and meadow, which ought to have been commonable at a certain time, ceases to be so; in the second, the right to send cattle to the waste is stinted in so much as the arable is put under defence, or the land is used for the construction of dwellings. By the common law the free tenants alone could obtain a remedy for any transgression in this respect. I have mentioned already that suits frequently arose when the old-fashioned rotation of crops was modified in accordance with the progress of cultivation. As to the right of approving from the waste, the relative position of lord and tenants was for a long time debateable, and, as everybody knows, the lord was empowered to approve by the Statute of Merton of 20 Henry III, with the condition that he should leave sufficient pasture to his free tenants according to the requirements of their tenements. The same power was guaranteed by the Statute of Westminster II against the claims of neighbours. It has been asked whether, before the Statute of Merton, the lord had power to enclose against commoners, if he left sufficient common to satisfy their rights. Bracton's text in the passage where he treats of the Statute is distinctly in favour of the view that this legislative enactment did actually alter the common law, and that previously it was held that a lord could not approve without the consent of his free-tenants[560]. Turning to the practice of the thirteenth-century courts, we find that the lawyers were rather doubtful as to this point. In a case of 1221 the jurors declare, that although the defendant has approved about two acres of land from the waste where the plaintiff had common, this latter has still sufficient pasture left to him. And thereupon the plaintiff withdraws[561]. In 1226 a lord who has granted pasture everywhere, 'ubique,' and has inclosed part of it, succumbs in a suit against his tenant, and we are led to suppose that if the qualification 'ubique' had been absent, his right of approvement would have been maintained. It must be noticed, however, that the marginal note in Bracton's Note-book does not lay stress on the 'ubique,' and regards the decision as contrary to the law subsequently laid down by the Constitution of Merton[562]. In a case of 1292 one of the counsel for the defendant took it for granted that the Statute of Merton altered the previously existing common law[563]. The language of the Statutes themselves is certainly in favour of such a construction: in the Merton Constitution it is stated as a fact that the English magnates were prevented from