What could I personally undertake to further the great objects of such investigation? The ground has been surveyed by powerful minds, and many controversies show that it is not an easy one to explore. Two main courses seemed open in the present state of the study. A promising method would have been to restrict oneself to a definite provincial territory, to get intimately acquainted with all details of its geography, local history, peculiarities of custom, and to trace the social evolution of this tract of land as far back as possible, without losing sight of general connexions and analogies. How instructive such work may become may be gathered from Lamprecht's monumental monograph on the Moselland, which has been rightly called by its author 'Deutsches Wirthschaftsleben im Mittelalter.' Or else, one might try to gather the general features of the English mediaeval system as embodied in the numerous, one might almost say innumerable, records of the feudal period, and to work back from them into the imperfectly described pre-feudal age. Such enquiry would necessarily leave out local peculiarities, or treat them only as variations of general types. From the methodical point of view it has the same right to existence as any other study of 'universalities' which are always exemplified by individual beings, although the latter are not made up by them, but appear complicated in every single case by additional elements. Being a foreigner, I was driven to take the second course. I could not trust myself to become sufficiently familiar with local life, even if I had the time and opportunity to study it closely. I hope such investigations may be taken up by scholars in every part of England and may prosper in their hands; the gain to general history would be simply invaluable. And I was not sorry of the necessity of going by the second track, because I could hope to achieve something useful even if I went wrong on many points. Every year brings publications of Cartularies, Surveys, Court-rolls; the importance of these legal and economic records has been duly realised, and historians take them more and more into account by the side of annals and statutes. But surely some attempt ought to be made to concentrate the results of scattered investigation in this field. The Cartularies of Ramsey, Battle, Bury St. Edmunds, St. Paul's, the Hundred Rolls, the Manorial Records of Broughton and King's Ripton, give us material of one and the same kind, which, for all its wealth and variety, presents great facilities for classification and comparison[1]. I have seen a good many of these documents, both published and in manuscript, and I hope that my book may be of some service in the way of concentrating this particular study of manorial records. I am conscious how deficient my work is in many respects; but if by the help of corrections, alterations, additions, it may be made to serve to some extent for the purpose, I shall be glad to have written it.