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This Essay does not in any way claim to be a Treatise on the subject. Lack of leisure has compelled me to omit many important topics and to deal all too briefly with others. My debt to previous writers - to Bensa, Huvelin, Schaube, Pollock and Maitland, and above all to Goldschmidt - is evident on every page; as far as time and opportunities allowed I have gone to the original authorities. While the Essay was in the Press, I learnt that there were numerous fair rolls preserved in the Record Office and upon these I am at work. To Sir F. Pollock for kind suggestions I wish to express my thanks.
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