Of the various sources accessible for the study of the English enclosure movement, one type only has been extensively used by historians. The whole story of this movement as it is usually told is based upon tracts, sermons, verses, proclamations, etc. of the sixteenth century--upon the literature of protest called forth by the social distress caused by enclosure. Until very recently the similar literature of the seventeenth century has been neglected, although it destroys the basis of assumptions which are fundamental to the orthodox account of the movement. Much of significance even in the literature of the sixteenth century has been passed over--notably certain striking passages in statutes of the latter half of the century, and in books on husbandry of the first half. Details of manorial history derived from the account rolls of the manors themselves, and contemporary manorial maps and surveys, as well as the records of the actual market prices of grain and wool, have been ignored in the construction of an hypothetical account of the movement which breaks down whenever verification by contemporary evidence is attempted. The evidence is in many respects imperfect. It would be of great value, for instance, to have access to records of grain production over an area extensive enough, and for a long enough period, to furnish reliable statistical indications of the trend of productivity. It would be helpful to have exact information about the amount of land converted from arable to pasture in each decade of the period under consideration, and to know to what extent and at what dates land was reconverted to tillage after having been laid to grass. There are no records to supply most of this information. It is possible that the materials for a statistical study of soil productivity are in existence, but up to the present time they have not been published, and it is doubtful if this deficiency will be supplied. It is even more doubtful whether more can be learned about the rate of conversion of arable land to pasture than is now known, and this is little. Professor Gay has made a careful study of the evidence on this question, and has analysed the reports of the government commissions for enforcing the husbandry statutes before 1600,[9] and Miss Leonard has made the returns of the commission of 1630 for Leicestershire available.[10] The conditions under which these commissions worked make the returns somewhat unreliable even for the years covered by their reports, and much interpolation is necessary, as there are serious gaps in the series of years for which returns are made. For dates outside of the period 1485-1630 we must rely entirely on literary references. Unsatisfactory as our statistical information is on this important question, it is far more complete than the evidence on the subject of the reconversion to tillage of arable land which had been turned into pasture.