The year 1086 is remarkable for the formation of one of the most unique monuments of William's genius as a ruler, and one of the most instructive sources of information which we have of the condition of England during his reign. At the Christmas meeting of the court, in 1085, it was decided, apparently after much debate and probably with special reference to the general land-tax, called the Danegeld, to form by means of inquiries, officially made in each locality, a complete register of the occupied lands of the kingdom, of their holders, and of their values. The book in which the results of this survey of England were recorded was carefully preserved in the royal treasury, and soon came to be regarded as conclusive evidence in disputed questions which its entries would concern. Not very long after the record was made it came to be popularly known as the Domesday Book, and a hundred years later the writer on the English financial system of the twelfth century, the author of the "Dialogue concerning the Exchequer,"[13] explained the name as meaning that the sentences derived from it were final, and without appeal, like those of the last great day. An especially interesting feature of this survey is the method which was employed to make it. Two institutions which were brought into England by the Conquest, the king's missi and the inquest, the forerunners of the circuit judge and of the jury, were set in motion for this work; and the organization of the survey is a very interesting foreshadowing of the organization which a century later William's great-grandson was to give to our judicial system in features which still characterize it, not merely in England but throughout great continents of which William never dreamed. Royal commissioners, or missi, were sent into each county. No doubt the same body of commissioners went throughout a circuit of counties. In each the county court was summoned to meet the commissioners, just as later it was summoned to meet the king's justice on his circuit. The whole "county" was present to be appealed to on questions of particular importance or difficulty if it seemed necessary, but the business of the survey as a rule was not done by the county court. Each hundred was present by its sworn jury, exactly as in the later itinerant justice court, and it was this jury which answered on oath the questions submitted to it by the commissioners, exactly again as in the later practice. Their knowledge might be reinforced, or their report modified, by evidence of the men of the vill, or other smaller sub-division of the county, who probably attended as in the older county courts, and occasionally by the testimony of the whole shire; but in general the information on which the survey was made up was derived from the reports of the hundred juries. The questions which were submitted to these juries show both the object of the survey and its thorough character. They were required to tell the name of each manor and the name